TY - JOUR
T1 - Zwitterionic base-stabilized digermadistannacyclobutadiene and tetragermacyclobutadiene
AU - Yeong, Hui-Xian
AU - Xi, Hong-Wei
AU - Li, Yongxin
AU - Kunnappilly, Sophy Bhasi
AU - Chen, Bozhen
AU - Lau, Kai-Chung
AU - Hirao, Hajime
AU - Lim, Kok Hwa
AU - So, Cheuk-Wai
PY - 2013/10/18
Y1 - 2013/10/18
N2 - The syntheses of a zwitterionic base-stabilized digermadistannacyclobutadiene and tetragermacyclobutadiene supported by amidinates and low-valent germanium amidinate substituents are described. The reaction of the amidinate GeI dimer, [LGe:]2 (1, L=PhC(NtBu)2), with two equivalents of the amidinate tin(II) chloride, [LSnCl] (2), and KC8 in tetrahydrofuran (THF) at room temperature afforded a mixture of the zwitterionic base-stabilized digermadistannacyclobutadiene, [L2Ge2Sn2L 2] (3; L=LGe:), and the bis(amidinate) tin(II) compound, [L 2Sn:] (4). Compound 3 can also be prepared by the reaction of 1 with [LArSnCl] (5, LAr=tBuC(NAr)2, Ar=2,6-iPr 2C6H3) in THF at room temperature. Moreover, the reaction of 1 with the "onio-substituent transfer" reagent [4-NMe2-C5H4NSiMe3]OTf (8) in THF and 4-(N,N-dimethylamino)pyridine (DMAP) at room temperature afforded a mixture of the zwitterionic base-stabilized tetragermacyclobutadiene, [L 4Ge6] (9), the amidinium triflate, [PhC(NHtBu) 2]OTf (10), and Me3SiSiMe3 (11). X-ray structural data and theoretical studies show conclusively that compounds 3 and 9 have a planar and rhombic charge-separated structure. They are also nonaromatic. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
AB - The syntheses of a zwitterionic base-stabilized digermadistannacyclobutadiene and tetragermacyclobutadiene supported by amidinates and low-valent germanium amidinate substituents are described. The reaction of the amidinate GeI dimer, [LGe:]2 (1, L=PhC(NtBu)2), with two equivalents of the amidinate tin(II) chloride, [LSnCl] (2), and KC8 in tetrahydrofuran (THF) at room temperature afforded a mixture of the zwitterionic base-stabilized digermadistannacyclobutadiene, [L2Ge2Sn2L 2] (3; L=LGe:), and the bis(amidinate) tin(II) compound, [L 2Sn:] (4). Compound 3 can also be prepared by the reaction of 1 with [LArSnCl] (5, LAr=tBuC(NAr)2, Ar=2,6-iPr 2C6H3) in THF at room temperature. Moreover, the reaction of 1 with the "onio-substituent transfer" reagent [4-NMe2-C5H4NSiMe3]OTf (8) in THF and 4-(N,N-dimethylamino)pyridine (DMAP) at room temperature afforded a mixture of the zwitterionic base-stabilized tetragermacyclobutadiene, [L 4Ge6] (9), the amidinium triflate, [PhC(NHtBu) 2]OTf (10), and Me3SiSiMe3 (11). X-ray structural data and theoretical studies show conclusively that compounds 3 and 9 have a planar and rhombic charge-separated structure. They are also nonaromatic. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
KW - cyclobutadienes
KW - germanium
KW - N ligands
KW - tin
KW - zwitterions
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U2 - 10.1002/chem.201300447
DO - 10.1002/chem.201300447
M3 - RGC 21 - Publication in refereed journal
SN - 0947-6539
VL - 19
SP - 14726
EP - 14731
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 43
ER -