After "'Scheme 4 "', this bridge contained an exocyclic methylene group, but in the ultimate taxol molecule this bridge is an ?-acylketone.
22.
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.
23.
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 ).
24.
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 ).
25.
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 ).
26.
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 ?.
27.
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 ?.
28.
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.
29.
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.
30.
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 " '.
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