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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 14, Number 1
BKCSDE 14(1)
January 20, 1993

Title	New Transition Metal Mediated Alkylation Reaction of arachno-S2B7H8, Insertion Reaction of arachno-S2B7H8- with (CO)5M{C(R1)(R2)} (M = Cr, W ; R1 = CH3, C6H5 ; R2 = OCH3, SC6H5) : Synthesis and Characterization of arachno-4-RCH2-6,8-S2B7H8 (R=CH3,Ⅱa;
Author	Hee-Joo Jeon, Jae-Jung Ko, Kang-bong Lee, Sang Ook Kang*
Keywords
Abstract	Good yield synthetic routes for the production of new B-alkyl-dithiaborane clusters are reported. The syntheses of the B-alkyl-dithiaboranes are based on the use of Fischer-type carbene reagents to activate the B-H bonds of dithiaborane for alkyl-addition reactions and are the first examples of transition-mediated reactions of dithiaborane to be reported. Thus, reactions employing arachno-S2B7H8- and (CO)5M{C(R1)R2} (M = Cr, W; R1 = CH3, C6H5; R2 = OCH3, SC6H5) were found to yield the intermidiate anions Ⅰ, [(CO)5M{C(R1)R2S2B7H8}]-, which upon protonation gave the corresponding neutral, air-sensitive cluster arachno-4-RCH2-6,8-S2B7H8 (R = CH3, Ⅱa; C6H5, Ⅱb) range from 30 to 35% yield. Complexes Ⅱa and Ⅱb are isoelectronic with arachno-6,8-S2B7H9 and, on the basis of the spectroscopic data, are proposed to adopt a similar arachno cage geometry in which an RCH2 units are substituted to 4 position boron atom of the arachno-6,8-S2B7H9.
Page	113 - 117
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