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This image of a simple structural formula is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
When the single bond between the two centres is free to rotate, cis/trans descriptors become invalid. Two widely accepted prefixes used to distinguish diastereomers on sp³-hybridised bonds in an open-chain molecule are syn and anti. Masamune proposed the descriptors which work even if the groups are not attached to adjacent carbon atoms.
This image is a derivative work of the following images: File:Aldolsynanti.png licensed with PD-self 2006-11-30T05:51:12Z E kwan 1295x258 (9602 Bytes) syn vs anti convention; Uploaded with derivativeFX
The concepts of syn and anti addition are used to characterize the different reactions of organic chemistry by reflecting the stereochemistry of the products in a reaction. The type of addition that occurs depends on multiple different factors of a reaction, and is defined by the final orientation of the substituents on the parent molecule .
syn/anti peri/clinal. a torsion angle between 0° and ±90° is called syn (s) a torsion angle between ±90° and 180° is called anti (a) a torsion angle between 30° and 150° or between −30° and −150° is called clinal (c) a torsion angle between 0° and ±30° or ±150° and 180° is called periplanar (p)
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Chemical structure for w:zincophorin with syn and anti 1,3-w:diols highlighted. Image adapted from existing commons image File:Zincophorin.png and adapted by EdChem on 28 January 2019 using MS Paint. As a simple chemical structure, image is ineligible for copyright protection.