exocyclic वाक्य
उदाहरण वाक्य
मोबाइल
- After "'Scheme 4 "', this bridge contained an exocyclic methylene group, but in the ultimate taxol molecule this bridge is an ?-acylketone.
- At room temperature it produces a diastereomeric mixture of threo ( 63 % ) and erythro ( 19 % ) ?-hydroxyketone as well as 6 % of the exocyclic enone condensation product.
- The cleavage of the exocyclic double bond was difficult and accomplished only with forcing conditions ( 19 equivalents of osmium textroxide, 105 �C, 24 hours ) by the putative osmate ester ( 45 ).
- This diene group has 4 alkyl substituents ( labeled 1, 2, 3, 4 ) and the double bond in one ring is exocyclic to the other ( adding 5 nm for an exocyclic double bond ).
- This diene group has 4 alkyl substituents ( labeled 1, 2, 3, 4 ) and the double bond in one ring is exocyclic to the other ( adding 5 nm for an exocyclic double bond ).
- If in the cyclic Fischer projection the exocyclic oxygen atom at the anomeric centre is cis ( on the same side ) to the exocyclic oxygen attached to the anomeric reference atom ( in the OH group ) the anomer is ?.
- If in the cyclic Fischer projection the exocyclic oxygen atom at the anomeric centre is cis ( on the same side ) to the exocyclic oxygen attached to the anomeric reference atom ( in the OH group ) the anomer is ?.
- Typically, anomerization occurs through protonation of the exocyclic acetal oxygen, ionization to form an oxocarbenium ion with release of an alcohol, and nucleophilic attack by an alcohol on the reverse face of the oxocarbenium ion, followed by deprotonation.
- Database molecular editors such as Leatherface, RECAP, and Molecule Slicer allow large numbers of molecules to be modified automatically according to rules such as'deprotonate carboxylic acids'or'break exocyclic bonds'that can be specified by a user.
- Based on the observation made for the biosynthesis of agglomerin, it has been proposed that AbyA4 acetylates intermediate "'2 "'and AbyA5 catalyzes the elimination of acetic acid to form the exocyclic double bond in intermediate "'4 " '.
- This expansion is useful because it allows the expansion of a beta-ketoester to a large cyclic ketone which can easily be elaborated using either the cyclic ketone or the exocyclic ester . The bond migration steps in the Baeyer-Villiger oxidation ( A ) and the Beckmann rearrangement ( B ).
- Hyperconjugation can be used for rationalizing a variety of other chemical phenomena, including the anomeric effect, the gauche effect, the rotational barrier of ethane, the beta-silicon effect, the vibrational frequency of exocyclic carbonyl groups, and the relative stability of substituted carbocations and substituted carbon centred steric hindrance.
- To determine if the sugar is ? or ?, the structure is drawn in a Fischer projection; if the endocyclic oxygen ( O5 ) and exocyclic oxygen ( O1 ) are " cis ", the sugar is ?; if they are " trans ", the sugar is ?.
- The Buchner ring expansion is useful because it gives cycloheptatrienes as the ring opened products, which are found in the core of some natural products, such as azulenes . An important consideration in these ring expansions is the ring opening to an expanded ring and not an exocyclic group on the original ring or an unopenable product.
- For example, the invariant core residues G5, G8, G12 and C3 in the minimal hammerhead ribozyme were each observed to be so fragile that changing even a single exocyclic functional group on any one of these nucleotides results in a dramatic reduction or abolition of catalytic activity, yet few of these appeared to form hydrogen bonds involving the Watson-Crick faces of these nucleotide bases in any of the minimal hammerhead structures, apart from a G-5 interaction in the product structure.
- अधिक वाक्य: 1 2
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