Derivatives of the cyclic forms ofo-formylbenzoic acid,o-acetylbenzoic acid, 2-carboxyphenylacetaldehyde and of 4,4-dimethyl-3,4-dihydro-3-hydroxy-[1H]-isobenzopyran-1-one were formed including dipseudoanhydides and normal-pseudo anhydrides. Crystal and molecular structures formesoand (R,R/S,...
The average HO–C1–C2–N(Me3) dihedral angle is 61°. (B) Stereoimage of the CH---O hydrogen bonds (yellow dashes) present in the CutC-choline complex. (C) Diagram of protein and water interactions with the trimethylammonium moiety of choline with CH---O and hydrogen bond distances...
Significant distortion of the ring in the 2,3-pyridyne 1 was observed, with a shortening of the adjacent carbon–nitrogen bond such that it is shorter than the (formally) triple bond and a corresponding bond angle of c. 150°. The remaining derivatives 2–4 are much more symmetrical, ...
Derivatives of the cyclic forms of o-formylbenzoic acid, o-acetylbenzoic acid, 2-carboxyphenylacetaldehyde and of 4,4-dimethyl-3,4-dihydro-3-hydroxy-[1H]-isobenzopyran-1-one were formed including dipseudoanhydides and normal-pseudo anhydrides. Crystal and molecular structures for meso and (R,...
O bond-lengths and to the angle between the O-H and C O groups, it is found that the calculated v OH correlates with the calculated association enthalpy, transferred charge, dipole moment increment, and π-bond order, and also with the observed v CO frequency of acetaldehyde and acetone....