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Article: Synthesis, characterization, and reactivity of a novel thallium arylspiroboronate ester.(Report)
- Article from:
- Canadian Journal of Chemistry
- Article date:
- January 1, 2009
- Author:
CopyrightCOPYRIGHT 2009 NRC Research Press. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Introduction
The transition metal catalysed hydroboration of alkenes and alkynes has become a well-established technique in organic synthesis (1). One of the most active and selective groups of catalyst precursors for hydroborations using catecholborane (HBcat; cat = 1,2-[O.sub.2][C.sub.6][H.sub.4]) are those derived from addition of diphosphines to Rh(acac)[(coe).sub.2] (acac = acetylacetonato and coe = cyclooctene) (2). The actual catalyst resting state using these systems is believed to be a zwitterionic complex of the type Rh([[eta].sup.6]-catBcat)([P.sub.2]) (where [P.sub.2] = diphosphine), arising from the redistribution of substituents on HBcat. The ...
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... ... processed mathematically to yield an NMR spectrum. Such spectra contain lines, or ... a different frequency than a CH^sub 3^, a C=O, or carbon in an aromatic ... of information can be found in an NMR spectrum. The atomic nuclear sized magnets ...
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