… of cycloborasiloxanes: The X-ray crystal structures of cyclo-1, 3, 3, 5, 5-pentaphenyl-1-bora-3, 5-disiloxane and cyclo-1, 3, 3, 5, 7, 7-hexaphenyl-1, 5-dibora-3, 7- …

…, MF Mahon, KC Molloy, PJ Schofield

Index: Brisdon, Brian J.; Mahon, Mary F.; Molloy, Kieran C.; Schofield, Paul J. Journal of Organometallic Chemistry, 1992 , vol. 436, # 1 p. 11 - 22

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Citation Number: 29

Abstract

Abstract Cycloborasiloxanes [PhB (OSiPh 2) O] 2 (1) and RB [(OSiPh 2) 2][R= Ph (2); 2, 4, 6- Me 3 C 6 H 2 (3)] containing eight-and six-membered rings, respectively, have been synthesized by the reaction of RB (OH) 2 with 1, 1, 3, 3-tetraphenyl-1-3-dihydroxy-1, 3- disiloxane or diphenylsilanediol. The structures of 1 and 2 have been determined, and both contain essentially planar Si O B rings, although the Si O and B O bonds are shorter ...