Issue 25, 2019

Reaction of an N/Al FLP-based aluminum hydride toward alkynes: deprotonated alumination versus hydroalumination with regioselective cis-addition character

Abstract

Reactions of an N/Al FLP-based aluminum dihydride (o-TMP-C6H4)AlH2 (1, TMP = N(CMe2CH2)2CH2) with several terminal and internal alkynes were studied. 1 reacted with HC[triple bond, length as m-dash]CR by deprotonated alumination to yield (o-TMP-C6H4)Al(C[triple bond, length as m-dash]CR)2 (R = Ph (2), 1-C4H3S (3)) and with HC[triple bond, length as m-dash]CPPh2 by deprotonated alumination followed by HC[triple bond, length as m-dash]CPPh2 C(sp)–H-activation addition to yield [o-(TMP)H-C6H4]Al(C[triple bond, length as m-dash]CPPh2)3 (4). Furthermore, 1 reacted with R1C[triple bond, length as m-dash]CR2 to produce mono-hydroalumination compounds (o-TMP-C6H4)AlH(CR1[double bond, length as m-dash]CHR2) (R1,R2 = Ph,Ph (5), Ph,Et (6) and SiHMeR′,Ph (7, R′ = N(SiMe2Ph)-2,6-iPr2C6H3), all as monomers, as well as {(o-TMP-C6H4)AlH[C(PPh2)[double bond, length as m-dash]CHPh]}2 (8), a dimer formed due to the intermolecular P/Al donor–acceptor interaction. Moreover, bis-hydroalumination compounds (o-TMP-C6H4)Al(CR1[double bond, length as m-dash]CHR2)2 (R1,R2 = SiHMe2,PPh2 (9) and SiHPh2,PPh2 (10)) were produced. Natural Bond Orbital (NBO) analysis was performed, which revealed the inequivalent charge distribution on the C[triple bond, length as m-dash]C carbon atoms of the alkynes that have two different substituents. The electronic matching interaction between the Al–H and C[triple bond, length as m-dash]C bonds is discussed. The hydroalumination reaction exhibits the regioselective cis-addition character.

Graphical abstract: Reaction of an N/Al FLP-based aluminum hydride toward alkynes: deprotonated alumination versus hydroalumination with regioselective cis-addition character

Supplementary files

Article information

Article type
Paper
Submitted
28 fev 2019
Accepted
15 may 2019
First published
17 may 2019

Dalton Trans., 2019,48, 9152-9160

Reaction of an N/Al FLP-based aluminum hydride toward alkynes: deprotonated alumination versus hydroalumination with regioselective cis-addition character

Y. Chen, W. Jiang, B. Li, G. Fu, S. Chen and H. Zhu, Dalton Trans., 2019, 48, 9152 DOI: 10.1039/C9DT00903E

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