Palladium-Catalyzed Selective Mono-/Tetraacetoxylation of <i>o</i>-Carboranes with Acetic Acid via Cross Dehydrogenative Coupling of Cage B–H/O–H Bonds
作者:Tao-Tao Xu、Ke Cao、Ji Wu、Cai-Yan Zhang、Junxiao Yang
DOI:10.1021/acs.inorgchem.8b00038
日期:2018.3.5
with acetic acid via cross dehydrogenative coupling of cage B–H/O–H bonds has been developed, and a series of mono- and tetraacetoxylated o-carboranes have been synthesized with moderate to good yields as well as good selectivity. Mechanistic studies indicate that the acetoxyl originates from acetic acid directly, and a nucleophilic addition of PdIV-oxo species and dehydration process is proposed.
Metallization of 1-substituted 1-benzyl-o-carboranes with n-butyllithium and some conversions of 1-R-2-benzyllithium-o-carboranes
作者:L. I. Zakharkin、V. A. Ol'shevskaya
DOI:10.1007/bf00869528
日期:1992.2
It was shown that 1-R-2-benzyl-o-carboranes (R = Me, i-Pr, Ph, PhCH2) and other derivatives of o-carborane containing an ArCH2 group in positions 1 and 2 are readily metallized by n-butyllithium, forming the corresponding benzyllithium derivatives, which react with electrophilic reagents like the usual organolithium compounds, permitting the synthesis of various C-substituted 1-o-carboranes.
Study of the transmetallation of silicon derivatives ofo-carboranes on treatment with BunLi
作者:L. I. Zakharkin、V. A. Ol'shevskaya、V. V. Guseva、N. F. Shemyakin
DOI:10.1007/bf02495657
日期:1998.3
Silyl-substituted o-carboranes 1-R-2-Me3Si(CH2)(n)-1,2-C2B10H10 (R = Me, Ph; n = 0, 1) undergo transmetallation on treatment with (BuLi)-Li-n to form lithium derivatives of o-carboranes, 1-R-2-Li(CH2)(n)-1,2-C2B10H10, where n = 0, 1. A silicon derivative of o-carborane, 1-Ph-2-(Me3SiCHPh)-1,2-C2B10H10, undergoes neither transmetallation nor metallation at the benzyl CH-group on treatment with (BuLi)-Li-n due to significant steric hindrance.
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作者:R. V. Lebedev、S. K. Moiseev、O. G. Bondarev、M. M. Il"in、K. N. Gavrilov、V. N. Kalinin
DOI:10.1023/a:1015572605520
日期:——
The asymmetric synthesis of methyl 2-phenyl-2-(2-phenyl-ortho-carboran-1-yl)pent-4-enoate was carried out by palladium-catalyzed allylation in the presence of amino phosphites of the type (RO)(2)P-O-CH2-CHR'-NR"(2) as chiral ligands.