@article { ISI:000227933800013, title = {Benzoyl transfer reactivities of racemic 2,4-Di-O-acyl-myo-inosityl 1,3,5-orthoesters in the solid state: molecular packing and intermolecular interactions correlate with the ease of the reaction}, journal = {Chemistry-A European Journal}, volume = {11}, number = {7}, year = {2005}, month = {MAR}, pages = {2103-2110}, publisher = {WILEY-V C H VERLAG GMBH}, type = {Article}, address = {PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY}, abstract = {

Racemic 2,4-di-O-acyl-myoinosityl 1,3,5-orthoesters undergo transesterification catalyzed by sodium carbonate with varying ease of reaction in the solid state; reactions in solution and melt do not show such varied differences. An interesting crystal of a 1:1 molecular complex of highly reactive racemic 2,4-di-O-benzoyl-myo-inosityl 1,3,5-orthoformate and its orthoacetate analogue exhibited better reactivity than the latter component alone. Single-crystal X-ray structures of the reactants have been correlated with the observed differences in the acyl-transfer efficiencies in the solid state. Although each of the derivatives helically self-assembles around the crystallographic 2(1) axis linked through O-(HO)-O-... hydrogen bonding, the pre-organization of the reactive groups (C=O [El] and OH [Nu]), C-(HO)-O-... and the C=H(...)pi interactions are significantly more favourable for the reactive derivatives than the less reactive ones. Bond-length distributions also showed differences; the O-C bond of the axial benzoyl group, which gets cleaved during the reaction, is longer (1.345-1.361 angstrom) relative to the chemically equivalent O-C bond of the equatorial benzoyl group (1.316-1.344 angstrom) in the reactive derivatives. These bond-length differences are not significant in the less reactive derivatives. The overall molecular organization is different too; the strikingly discrete helices, which may be viewed as {\textquoteleft}{\textquoteleft}reaction tunnels{\textquoteright}{\textquoteright} and are held by interhelical interactions, are clearly evident in the reactive derivatives in comparison with the less reactive ones.

}, keywords = {hydrogen bonds, Inositol, solid-state reactions, structure elucidation, transesterification}, issn = {0947-6539}, doi = {10.1002/chem.200400851}, author = {Sarmah, M. P. and Gonnade, Rajesh G. and Shashidhar, M. S. and Bhadbhade, Mohan M.} } @article { ISI:000228607400011, title = {Sulfonate protecting groups. synthesis of O- and C-methylated inositols: D- and L-ononitol, D- and L-laminitol, mytilitol and scyllo-inositol methyl ether}, journal = {Tetrahedron}, volume = {61}, number = {18}, year = {2005}, month = {MAY}, pages = {4437-4446}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

Syntheses of D- and L-ononitol, D- and L-laminitol, mytilitol and scyllo-inositol methyl ether starting from myo-imositol are described. One or two of the inyo-inositol 1,3,5-orthoformate hydroxyl groups were protected as tosylates. These mono or ditosylates served as key intermediates for the preparation of O- and C-methyl inositols. Racemic 2,4-di-O-tosyl-myo-inositol 1,3,5-orthoformate was resolved as its diastereomeric camphanates. Use of sulfonate groups for the protection of inositol hydroxyl groups resulted in substantial improvement in the overall yield of O- and C-methyl inositols. (c) 2005 Elsevier Ltd. All rights reserved.

}, keywords = {Cyclitol, Inositol, Orthoester, Protecting group, sulfonate}, issn = {0040-4020}, doi = {10.1016/j.tet.2005.02.073}, author = {Sarmah, M. P. and Shashidhar, M. S. and Sureshan, K. M. and Gonnade, Rajesh G. and Bhadbhade, Mohan M.} } @article { ISI:000281980600018, title = {Conformational polymorphism in racemic 2,4-Di-o-Benzoyl-6-o-Tosyl myo-Inositol 1,3,5-Orthoacetate}, journal = {Journal of Structural Chemistry}, volume = {51}, number = {4}, year = {2010}, month = {AUG}, pages = {725-730}, publisher = {SPRINGER}, address = {233 SPRING ST, NEW YORK, NY 10013 USA}, abstract = {

The title compound, C(29)H(26)O(10)S, yields two conformational polymorphs concomitantly from dichloromethane-methanol mixture; the major polymorph grows as plates (Form I, monoclinic, P2(1)/n) and the minor polymorph grows as needles (Form II, triclinic, P-1). The two forms differ mainly in orientation of the tosyl group. In Form I, sulfonyl oxygen of the tosyl group makes intermolecular C -HaEuro broken vertical bar O interactions, whereas the same group in Form II is involved in an intramolecular short dipolar S=OaEuro broken vertical bar C=O (sulfonyl-carbonyl) contact. The molecular organization and the influence of various weak non-covalent interactions that stabilize these conformers in the crystal lattices are discussed.

}, keywords = {Conformation, crystal structure, dipolar interactions, Inositol, non-covalent interactions, polymorphism, sulfonyl-carbonyl contact}, issn = {0022-4766}, doi = {10.1007/s10947-010-0107-y}, author = {Manoj, Kochunnoonny and Gonnade, Rajesh G. and Bhadbhade, Mohan M. and Shashidhar, M. S.} }