About: Some halogenation reactions of nido-7,8,9,11-P2C2B7H9.

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About: Some halogenation reactions of nido-7,8,9,11-P2C2B7H9. Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Halogenations of the diphosphadicarbaborane nido-7,8,9,11-P2C2B7H9 using the AlCl3/CCl4, and I-2/AlCl3/C6H6 halogenation systems resulted in the formation of a mixture of mono- and disubstituted derivatives 10-X-nido-7,8,9,11-P2C2B7H8 (for X = Cl and I, yields 6 and 21%, respectively) and 5,10-X-2-nido-7,8,9,11-P2C2B7H7 (for X = Cl and I, yields 57 and 46%, respectively). These results show that the halogenation under electrophilic conditions takes place at positions most distant from the P atoms, but at sites adjacent to the CH units. In contrast, the bromination with N-bromosuccinimide in CH2Cl2 is probably of radical character, proceeding in positions adjacent to the P centres to give 3-Br-nido-7,8,9,11-P2C2B7H8 (yield 41%) and 2,3-Br-2-nido-7,8,9,11-P2C2B7H7 (yield 5%). The mixtures of the halo derivatives were separated by column chromatography on silica gel. Individual compounds were characterized by mass spectrometry and multinuclear (B-11, H-1, and P-31) spectroscopy combined with two-dimensio Halogenations of the diphosphadicarbaborane nido-7,8,9,11-P2C2B7H9 using the AlCl3/CCl4, and I-2/AlCl3/C6H6 halogenation systems resulted in the formation of a mixture of mono- and disubstituted derivatives 10-X-nido-7,8,9,11-P2C2B7H8 (for X = Cl and I, yields 6 and 21%, respectively) and 5,10-X-2-nido-7,8,9,11-P2C2B7H7 (for X = Cl and I, yields 57 and 46%, respectively). These results show that the halogenation under electrophilic conditions takes place at positions most distant from the P atoms, but at sites adjacent to the CH units. In contrast, the bromination with N-bromosuccinimide in CH2Cl2 is probably of radical character, proceeding in positions adjacent to the P centres to give 3-Br-nido-7,8,9,11-P2C2B7H8 (yield 41%) and 2,3-Br-2-nido-7,8,9,11-P2C2B7H7 (yield 5%). The mixtures of the halo derivatives were separated by column chromatography on silica gel. Individual compounds were characterized by mass spectrometry and multinuclear (B-11, H-1, and P-31) spectroscopy combined with two-dimensio (en)
Title	Some halogenation reactions of nido-7,8,9,11-P2C2B7H9. Some halogenation reactions of nido-7,8,9,11-P2C2B7H9. (en)
skos:prefLabel	Some halogenation reactions of nido-7,8,9,11-P2C2B7H9. Some halogenation reactions of nido-7,8,9,11-P2C2B7H9. (en)
skos:notation	RIV/61388980:_____/02:50023002!RIV/2003/AV0/A50003/N
http://linked.open.../vavai/riv/strany	783;790
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(LN00A028), Z(AV0Z4032918)
http://linked.open...iv/cisloPeriodika	6
http://linked.open...vai/riv/dodaniDat	2003
http://linked.open...aciTvurceVysledku	Holub, Josef Štíbr, Bohumil Bakardjiev, Mario
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav anorganické chemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	664204
http://linked.open...ai/riv/idVysledku	RIV/61388980:_____/02:50023002
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	boron; boranes; diphosphadicarbaboranes (en)
http://linked.open.../riv/klicoveSlovo	boranes boron diphosphadicarbaboranes
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[0E0E31D96233]
http://linked.open...i/riv/nazevZdroje	Collection of Czechoslovak Chemical Communications
http://linked.open...in/vavai/riv/obor	CA
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...ocetUcastnikuAkce	0 (xsd:int)
http://linked.open...nichUcastnikuAkce	0 (xsd:int)
http://linked.open...vavai/riv/projekt	New inorganic compounds and advanced materials
http://linked.open...UplatneniVysledku	2002
http://linked.open...v/svazekPeriodika	67
http://linked.open...iv/tvurceVysledku	Bakardjiev, Mario Holub, Josef Štíbr, Bohumil
http://linked.open...n/vavai/riv/zamer	Synthesis and structure of novel (inorganic) compounds, clusters and composites; mechanisms of conversion and transfer in systems involving inorganic substance
issn	0010-0765
number of pages	8 (xsd:int)

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