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The 3rd supplement continues the updating of the original 20
volumes on boron compounds published between 1974 and 1979. The
first supplement consisting of 3 volumes covered all the literature
uniformly up to the end of 1977, whereas the two volumes of the 2nd
supplement have extended the literature coverage of boron compounds
to 1980 and the four volumes of the 3rd supplement to 1984. The
present volume continues the description of boron compounds with
halogens, presenting those with chlorine, bromine and iodine. The
compounds with chalcogens are completed here along with those of
boron with S, Se, Te and Po. The final chapter on carboranes
contains the carboranes themselves, together with
metallacarboranes, and in the last section a description of
carborane-containing polymers, mostly derived from the three
isomeric dicarbadodecarboranes. Volume 4 of the 3rd supplement
brings this supplement series to an end. It will be supplemented by
a separately appearing index volume, which contains all the boron
compounds dealt with in volumes 1 - 4 of this supplement series.
The present issue, Volume 2 of "Boron Compounds" 4th Supplement of
the Gmelin Hand book, updates the previous issues by reporting the
literature on boron-oxygen systems published up to 1988. For some
important recent developments literature is covered through
mid-1992; this concerns, for example, the compounds -Ba3 B306h and
U B305J which became of interest as materials with nonlinear
optical properties. The volume directly com plements the earlier
"Boron Compounds" 3rd Supplement Volume 2. In the original
literature, alternative formulations are frequently used for the
same com pound. This is especially true for many borates. Often,
these species are neither completely heteropolar nor covalent, and
an experimentally based decision has not been made. Hence, the use
of brackets does not necessarily reflect a truly salt-like
character. Volume 1 (systems with hydrogen and noble gases) of this
particular supplement will be published subsequently, whereas
Volume 3a (boron and nitrogen), Volume 3b (boron and nitrogen,
boron and fluorine), and Volume 4 (boron compounds containing Cl,
Br, I, S, Se, and Te, as well as a section containing carboranes)
have already been published. All volumes of the 4th supplement will
be augmented by a formula index. The IUPAC nomenclature is
generally adhered to; thf means tetrahydrofuran; and occa sionally
additional abbreviations for compounds are explained in the text.
Positive signs for chemical shifts of the NMR signals indicates
downfield shifts from the references, usually internal (CH3)4Si for
olH and 013C with others being specified."
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