| 词汇 | example_english_addition-reaction |
| 释义 | Examples of addition reactionThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. The first step in this reaction is an additionreaction of sodium bisulfite to an aromatic double bond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The first reaction shown below, from the synthesis of taxane skeleton, uses a copper-based catalyst supported by a chiral phosphoramidite ligand for a conjugate carbonyl additionreaction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Conjugate addition reactions of allylsilanes are possible, although unsaturated aldehydes undergo only 1,2 addition. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Their work, first published in 1937, was intended as a preliminary progress report of thermochemical studies of energy changes during addition reactions of various unsaturated and cyclic compounds. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The reaction is a form of electrophilic addition; it is similar to the halogen additionreaction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Two non-polar additionreaction exists as well called free radical addition and cycloadditions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Kinetic control means that the forward aldol additionreaction must be significantly faster than the reverse retro-aldol reaction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. An additionreaction is the opposite of an elimination reaction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This nucleophile reacts with the electrophilic alkene 3 to form 4 in a conjugate additionreaction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The substrate of an electrophilic additionreaction must have a double bond or triple bond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. As a class of additionreaction, cycloadditions permit carboncarbon bond formation without the use a nucleophile or electrophile. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The same is true when an alkene reacts with water in an additionreaction to form an alcohol which involve formation of carbocations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is an electrophilic additionreaction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Light converts elemental bromine into a bromine radical, which attacks the alkene in a radical additionreaction to a bromo-alkane radical; and now single bond rotation is possible. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Once benzene is produced, the synthesis of more complex compounds occurs via simple substitution or addition reactions. It is a syn additionreaction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Its reactivity is characteristic of an ordinary polyene, i.e. it undergoes addition reactions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Organocopper reagents are now commonly used in organic synthesis as mild, selective nucleophiles for substitution and conjugate addition reactions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The basic reaction types are: addition reactions, elimination reactions, substitution reactions, pericyclic reactions, rearrangement reactions and redox reactions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Diborane also reacts readily with alkynes to form substituted alkene products which will readily undergo further addition reactions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Aromatic compounds undergo electrophilic aromatic substitution and nucleophilic aromatic substitution reactions, but not electrophilic addition reactions as happens with carbon-carbon double bonds. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During the reaction, the carbon-oxygen double bond is broken, and the carbonyl group may experience addition reactions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There are two main types of polar addition reactions: electrophilic addition and nucleophilic addition. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Addition reactions are limited to chemical compounds that have multiple bonds, such as molecules with carbon-carbon double bonds (alkenes), or with triple bonds (alkynes). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Hence, these compounds are more resistant to addition reactions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Addition reactions are inherently atom efficient, so are preferred synthesis pathways. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most addition reactions to alkenes follow the mechanism of electrophilic addition. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is used in organic synthesis as a source of the ethyl carbanion in addition reactions to carbonyl groups. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Addition reactions are also encountered in polymerizations and called addition polymerization. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Ketones at the 11 position are so much less reactive than those at 17 that they are virtually inert to addition reactions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. On the other hand some nucleophilic addition reactions involving addition to a carbonyl group in general show the opposite trend. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Diastereoselectivity is generally high in these addition reactions, and the resulting -cyano carbonyl compounds can be converted to a number of steroidal products. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Because of its special molecular structure, ethylene oxide easily participates in addition reactions; e.g., opening its ring and thus easily polymerizing. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The term is also applied to certain nucleophilic addition reactions, such as in the acid catalyzed hydrolysis of nitriles to amides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Addition reactions are commonly very fast and exothermic. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A series of addition reactions ensues. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Various other addition reactions are also known. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Addition reactions of this type are numerous. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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