The Halides of Boron

Massey, Andrew

doi:10.1016/s0065-2792(08)60177-6

Advances in Inorganic Chemistry and Radiochemistry

1968

DOI: 10.1016/s0065-2792(08)60177-6

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The Halides of Boron

Andrew Massey

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Cited by 18 publications

References 704 publications

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Crystallographic report: Trimethylaminedibromopropoxycarbonylborane

Shalom

Takrouri

Goldberg

et al. 2005

Applied Organom Chemis

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The conformation around the boron atom is nearly tetrahedral, with Br-B-Br bond angles of 109.14(19) • COMMENTA new one-pot method for the synthesis of trimethylaminedibromocarboxyborane esters from trimethylaminecarboxyborane in high purity and excellent yields was reported previously.1 Since a boron-attached bromine atom is considered to be a good leaving group, 2 such compounds are considered as precursors for boron-substituted amine carboxyboranes, which are isoelectronic boron analogs of α-amino acids and their derivatives.3 In this connection, the molecular structure has been determined, Fig. 1. The conformation around the boron atom is nearly ideally tetrahedral, with Br-B-Br bond angles of 109.14(19)• and slightly wider N-B-C bond angles up to 113.6(3)• . The observed data are comparable to those found in related compounds that contain an N-BBr 2 -C fragment.4,5 EXPERIMENTALThe title compound was prepared from trimethylaminecarboxyborane in a one-pot method as described elsewhere.

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Crystallographic report: Trimethylaminedibromopropoxycarbonylborane

Shalom

Takrouri

Goldberg

et al. 2005

Applied Organom Chemis

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Beiträge zur Chemie des Bors, L Dimethylamino‐polyborane

1970

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Durch Enthalogenieren von Chlor‐dimethylamino‐boranen wie R2NBCl2, (R2N)2BC1 oder (R2N)3B2C1 (R = CH3) mit Na/K‐Legierung erhält man Dimethylamino‐polyborane Bn(NR2)n + 2 mit kettenförmiger Verknüpfung der Boratome. Partielle Substitution der R2N‐Gruppen in den Polyboranderivaten durch Chlor ist unter Erhalt der Kettenstruktur möglich. Oxydation von B3[N(CH3)2]5 bzw. B4[N(CH3)2]6 mit Sauerstoff liefert B[N(CH3)2]3 und [(CH3)2NBO]3.

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Beiträge zur Chemie des Bors, 209. 1,2‐Diboran(4)diyl‐ und 1,3‐Triboran(5)diyl‐ditosylate und ‐bis(triflate): Elektronenpräzise Polyboran‐Derivate mit aktiven Austrittsgruppen

Nöth

1991

Chem. Ber.

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Contributions to the Chemistry of Boron, 209. — 1,2‐Diborane(4)diyl and 1,3‐Triborane(5)diyl Ditosylate and Bis(triflate): Electron‐Precise Polyborane Derivatives with Active Leaving Groups Introduction of the tosylate or triflate group into dimethylamino polyboranes gives electron‐precise polyborane derivatives of high reactivity. Five representatives 1 – 4 of these types of compounds are reported. The RSO3 groups strengthen the B – N bond while they are good leaving groups as shown by alkylation reactions when using LiR compounds. The X‐ray structure of B2(NMe2)2(tos)2 (1) reveals C2 symmetry, and this also holds for B2(NMe2)2(CCPh)2 (7). While the two BNO planes in 1 include an angle of 80.8°, the two BNC planes in 7 are closer to orthogonality (84.6°). In contrast, the bis(9‐fluorenyl)diborane 10 reveals different structures in solution and the solid state. Experimental results correspond fairly well with MNDO calculations on model compounds B2(NH2)2X2, particularly with B – B and B – N bond lengths and conformations. They also suggest that nucleophilic substitutions at 1 – 4 may proceed by a dissoziative process.

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The Halides of Boron

Cited by 18 publications

References 704 publications

Crystallographic report: Trimethylaminedibromopropoxycarbonylborane

Crystallographic report: Trimethylaminedibromopropoxycarbonylborane

Beiträge zur Chemie des Bors, L Dimethylamino‐polyborane

Beiträge zur Chemie des Bors, 209. 1,2‐Diboran(4)diyl‐ und 1,3‐Triboran(5)diyl‐ditosylate und ‐bis(triflate): Elektronenpräzise Polyboran‐Derivate mit aktiven Austrittsgruppen

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