1. 1. BTC: chemical vocabulary
BTC is the abbreviation of (Trichloromethyl) carbonate. It is the abbreviation of a chemical substance, mainly composed of carbon, chlorine and oxygen. The chemical formula is c3cl6o3, which can be used as the substitute proct of highly toxic phosgene and diphosgene in the synthesis
BTC: enterprise abbreviation
BTC refers to BTC Yingqun enterprise from Taiwan, China, which is a large-scale high-tech enterprise developing and procing keyboard, mouse and recorder. BTC is famous for procing high-quality computer peripherals. BTC is the OEM keyboard and add-on card proced by famous brand EMPREX, ranking first in Taiwan, especially the third in the world
BTC: the concept of
bitcoin was first proposed by Nakamoto on November 1, 2008, and was formally born on January 3, 2009. According to the idea of Nakamoto, the open source software is designed and released, and the P2P network on it is constructed. Bitcoin is a virtual encrypted
digital currency in the form of P2P. Point to point transmission means a decentralized payment system BTC: engineering material
BTC (buttress thread coupling), full name of partial trapezoidal thread coupling, is an API standard thread connection type, which is commonly used in the connection of petrochemical pipes or tools, such as floating collar, guide shoe and pipe shoe used in cementing operation
5, BTC: e-commerce mode
BTC (business to customer) e-commerce is one of the categories of e-commerce by trading partners, that is, e-commerce of commercial institutions to consumers. This form of e-commerce is generally based on the network retail instry, mainly with the help of the Internet to carry out online sales activities. BTC is also known as B2C, B2C mode is the earliest e-commerce mode in China
2. About Of (the table belongs to); Born of; born of; Because
of English; v] Beauty [&; v]
double interpretation prep ( (preposition)
1; In the course of; Ring
2
As far as, as far as, as far as, as far as, as far as, as far as, as far as, as far as, as far as ( I have heard of him This is a photo of my dog.
this is a photo of my dog
He is a friend of my father He is a prime minister of working class origin He listed the kings and queens of England
extended materials:
usage of synonyms
from English [fr & # 601; m] Beauty [fr &, 601; m]
definition: prep; come from; From (...)
example sentences
are used as prepositions ( He descended from a good family
2、From what author does this quotation come?
Who is the author of this quotation Bitter words from you will only hurt her My answer seems to come from the subconscious I had a phone call from Mary
3. As a virtual digital currency in the form of P2P, bitcoin is very popular in recent years, and many people will dig bitcoin. So, what's the use of bitcoin
bitcoin is generated by a large number of calculations based on a specific algorithm. Its essence is the special solution generated by a bunch of complex algorithms, and the process of digging bitcoin is to continuously seek the special solution of the equations through a huge amount of calculation. The equations are designed to have only 21 million specific solutions, so the upper limit of bitcoin is only 21 million
so if you want to dig bitcoin, you can use the computer to dig it. You can download the special bitcoin computing tool to do the operation to dig bitcoin
of course, the more professional the equipment is, the greater the probability of being able to dig. Therefore, we will carefully select the right
mining machine and pool before digging bitcoin. For example, the BTC guild mine in foreign countries is very famous. As for the mining machine, it is a computer used to earn bitcoin, but the computer is equipped with professional mining chips. After all, bitcoin is a hot card. The price of a miner ranges from two or three hundred yuan to 200000 yuan.
4. Based on the concept of "decentralization", the price of bitcoin has increased millions of times in the 11 years since its birth. In October 2009, the initial price of bitcoin was about US $0.00076/coin; On December 17, 2017, bitcoin reached the highest price in history, with a single bitcoin as high as $19142
the real price start is in October 2010. Before that, you can buy 10W pieces for 1W yuan. But this is because no one bought it, resulting in extremely low prices. If someone wants to buy 10W, the price will be higher than 1W.
5. What is bitcoin to eat?
6. With the development of the Internet, nowadays people go shopping without cash. More young people tend to use mobile payment. We have to admit that "mobile payment" has been integrated into people's life, which brings us great convenience and also saves a lot of costs. Today, this kind of currency is also a kind of virtual currency. It is more like an investment proct. From a few yuan, a bitcoin has risen to 60000 yuan. Do you remember the stupid Chinese who bought 100000 bitcoins at that time? What's his status
eight years ago, there was such an English teacher. In his spare time, he liked to invest in various stocks and currencies, and bitcoin was one of his early investment projects. At that time, before other people found the potential value of bitcoin, he found this business opportunity, so he kept buying bitcoin for several years, The total number of bitcoins has reached 100000, which seems very stupid in other people's eyes. Unexpectedly, it has changed his life. He is Li Xiaolai, known as "the richest person in bitcoin in China"
in those years, he got rich overnight because of this incident, and his value rose directly to 6 billion yuan. After his success, he set up his own investment company, which specializes in investing in the currency of the value in the circle. Now his value is hard to estimate, but it is certain that Li Xiaolai is a lucky man with faith. He has successfully proved his vision, What do you think of this
7. I've played too. Don't play any more. It's just deceiving. When you asked for five yuan, he said that you didn't ask until level 40. When you get to level 40, it's a lie to say how many videos you need to watch.
8. bitcoin mining machine scam is to make money by leasing or selling mining machines
the so-called "mining machine" refers to the computer that installs and runs specific software and algorithms. As we all know, bitcoin can only be obtained through long-term running algorithm of computer, and the total amount is limited. Therefore, some manufacturers have launched specially designed and optimized computer procts, known as "mining machine"
in January 2018, a mining computer named "Kodak kashminer" appeared at the international consumer electronics exhibition in Las Vegas, which aroused people's attention. But now critics point out that the mining machine plan is actually a fraud, and the publicity for profit is also false
precautions:
1. The general computer configuration of bitcoin household can not meet the requirements of bitcoin miner, so it is difficult to earn the electricity cost of a day
2. If you have to use bitcoin mining machine to dig coins, it is suggested to choose a reliable and legal platform to go more steadily. In the legal platform mining, the daily income can be seen, and a certain amount can be withdrawn
9. Zn + 2HCl = = = ZnCl2 + H2 ↑
65 73 136 2
6.5g X Y Z
65 / 6.5g = 73 / x = 136 / y = 2 / Z
x = 7.3g
y = 13.6g
Z = 0.2g1 mass of hydrogen 0.2g
2 mass fraction of solute in dilute hydrochloric acid 7.3g/100g * 100% = 7.3%
3 mass fraction of solute in solution after reaction 13.6g / (6.5g + 100g-0.2g) * 100% = 12.8%
10. Acyl chloride is an important carboxylic acid derivative, which has important applications in organic synthesis, drug synthesis, etc. It mainly includes hydrolysis, alcoholysis, ammonolysis, reaction with organic metal reagent, primary reaction α Hydrogen halogenation and other reactions acyl chloride splashing acylation reagent limit structure resonance hybrid species resonance effect stability enhancement carbonyl carbon and free group bond resonance effect species stability effect depends on the bond original orbital cross cover acyl chloride is affected by species resonance energy species resonance need carbon 2p orbital and chlorine 3P orbital cross cover two kinds of orbital same cross cover CL structure (Ⅱ) contribution acyl chloride is stabilized e to resonance effect Acyl chloride splashing acylation reagent some carboxylic acids can carry out or non slow reaction. Carboxylic acid can proce acyl chloride to improve the reactivity yield. At present, SOCl2, phosphorus trichloride, phosphorus pentachloride and triphosgene are used to prepare acyl chloride. In this paper, 1 dichlorosulfoxide 1.1 dichlorosulfoxide acyl chloride can be prepared by using fatty acids (including saturated fatty acids), aromatic acids, organic sulfonic acids (amino acids, halogenated acids, etc.) as catalyst N, N-dimethylformamide (DMF), N, Generally, N-dimethylaniline pyridine reacts with catalyst first, and then reacts with carboxylic acid. Acyl chloride (1) trimethylacetic acid lactam reacts with thionyl chloride. The yield of trimethylacetyl chloride is 96% (CH3) 3ccooh → (SOCl2 lactam) → (CH3) 3cocl (2) (m) benzenedicarboxylic acid thionyl chloride. Two kinds of procts are mainly used for organic synthesis, and plasticizers are widely used at present Diisooctyl phthalate (DOTP) diisooctyl phthalate raw material (3) o-chlorobenzoic acid thionyl chloride reaction o-chlorobenzoyl chloride this proct is mainly used for organic synthesis and pharmaceutical dyestuff synthesis (4) butyl (heptyl, octyl, decanoic) acid thionyl chloride reaction to prepare butyl (heptyl, octyl, decanoic) acid Four procts are used in the synthesis of pharmaceutical intermediates CH3 (CH2) ncooh → (SOCl2) → CH3 (CH2) ncocln = 4-20 (5) stearic acid chlorinated sulfoxide to proce stearic acid chloride. They are used in the synthesis of skincare procts bisstearic acid kojic acid ester to prepare papermaking instrial sizing agent - AKD (6) organic sulfonic acid catalyst. The sulfonyl chloride is prepared by the reaction with thionyl chloride Sulfonic acid sodium reacts directly with thionyl chloride sulfonyl chloride 1.2 advantages and disadvantages of preparing acyl chloride by thionyl chloride; In addition, the proction cost of sulfoxide chloride is high and the corrosion of equipment is serious. 2. The reaction of phosphorus trichloride (1) propionic acid and phosphorus trichloride is propionyl chloride. The reaction formula is ch3ch2cooh → (PCl3) → ch3ch2cocl. Propionyl ammonia is mainly used in combination with anticonvulsant drugs such as Metoprol, cholesterol, etc (2) reaction of lauric acid with phosphorus trichloride lauroyl chloride reaction: 3c11h23cooh + PCl3 → 3c11h23cocl + h3po3 this proct is used for the synthesis of sodium dodecyl lauroyl amino acid acetals (3) reaction of oleic acid with phosphorus trichloride to proce oleoyl chloride reaction: CH3 (CH2) 7 (CH2) 7coohpcl3ch3 (CH2) 7 (CH2) 7cocl & gt; C=C=C< Hhnaohhh this proct is mainly used in the detergent LS (c25h40nnao5s) 204 for the preparation of organic compounds. It is used to prepare acyl chloride from phosphorus trichloride. It is suitable for the preparation of low boiling point acyl chloride reaction. Phosphite is easy to volatilize and evaporate acyl chloride 3. Phosphorus pentachloride (1) oxalic acid reaction to prepare oxalyl chloride reaction: coohpcl5cocl ∣ →∣ + 2pocl3 + hclcoohcocl. The pharmaceutical surface of this proct is used as antibiotic raw material and used as methacryloyl isocyanate (2) succinic acid reacts with phosphorus pentachloride to form succinyl chloride: ch2coohpcl5ch2cocl ∣ →∣ + POCl3 + h2och2coohch2cocl this proct is used for synthesis of antiepileptic and antispasmodic drugs succinylcholine chloride resin intermediate phosphorus pentachloride is suitable for preparation of high boiling point acyl chloride, POCl3 evaporated, 4 triphosgene triphosgene, high melting point, low volatility and low toxicity, even if boiling point Only a small amount of instrial toxic substances need to be treated and participate in the chemical reaction, with high selectivity and high yield. It is safe and convenient to use, and easy to transport and store medicines, pesticides It is widely used in the synthesis of related chemical procts that phosgene or biphosgene is completely replaced by high-quality materials in mechanochemical instry. 4.1 ring the application, 5 carboxylic acids are chlorinated with triphosgene (1) c6h5-ch2cooh + 1 / 3btc → (dmf60 ℃) → c6h5-ch2cocl + CO2 + HCl in 71% yield (2) ch3-c6h4-cooh + 1 / 3btc → (dmfch2cl2) → ch3-c6h4 + cocl4.2- 5-chloroformyloxy-isopeptidyl chloride (CFIC) was prepared by triphosgene reaction with hydroxyisophthalic acid composite catalyst. The yield of CFIC was 42.3%, which was 9.7% and 27.7% higher than that of DuPont hydraulics patent, The yield of 3-dichloroquinoline-6-carboxyacyl chloride is 80%. 5 kinds of oxalyl chloride are used for acylation of acids and amines to prepare pesticides, fungicides, pharmaceutical antineoplastic agents, X-ray contrast agents, etc The transportation and storage of phosgene are dangerous. The transportation and storage of phosgene are safer than phosgene. It is a kind of highly toxic and pungent liquid It is still dangerous to store. 6.3 the reaction of carbohydrates with CCl4 often requires the preparation of acyl chloride. The yield of acyl chloride is usually low in the traditional way. However, the preparation of acyl chloride with CCl4 triphenylphosphine system has a good yield. The reaction mechanism is: (C6H5) 3P + CCl4 → (C6H5) 3 + pccl3cl - Ⅰ + rcooh → rcoo + P (C6H5) 3 + hccl3 Ⅱ → rcocl + (C6H5) 3PO Comparison of the use efficiency of acid sensitive compounds in acid substances such as SO2 6.4 Hexachloroacetone Although the preparation of acyl chloride has been widely used, it plays a decisive role in the development of synthesis.
is there any by-proct of acyl chloride made from acid in esterification
