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Reducing Ga-H and Ga-C bonds in close proximity to oxidizing peroxo groups: conflicting properties in single molecules

机译:在氧化过氧基团附近还原Ga-H和Ga-C键:单分子中的冲突性质

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Treatment of [Li(H(2)Ga{CH(SiMe(3))(2)}(2))]2 OEt(2) (12 OEt(2)) with two equivalents of tert-butyl hydrogen peroxide, H-O-O-CMe(3), afforded the organogallium peroxide [({(Me(3)Si)(2)HC}(2)Ga(OH)(OOCMe(3))Li)(2)] (3), which possesses oxidizing peroxo groups in close proximity to reducing Ga-C bonds. The lithium atoms of the dimeric formula units are coordinated by both oxygen atoms of the peroxides and by two hydroxo groups. The cleavage of the Ga--C bond was not observed, even when an excess of H-O-O-CMe(3) was applied. Instead, the adduct [{(Me(3)Si)(2)HC}(2)Ga(OH)(OOCMe(3))(2)Li(2)(HOOCMe(3))] (4) was isolated, which has an intact H-O-O-CMe(3) molecule terminally attached to lithium. A similar structural motif was found for the compound [(LiOOCMe(3))(2)(HOOCMe(3))(2)] (5). The trihydrido gallanate [Li(H(3)Ga-{CH(SiMe(3))(2)})]OEt(2) (2) yielded the unique peroxide [({(Me(3)Si)(2)HC}--Ga(H)(OOCMe(3))(2)Li)(2)] (6) under similar conditions that possesses Ga-C and even more reactive Ga-H bonds beside peroxo groups. It decomposed at room temperature by the insertion of oxygen atoms into the Ga-H bonds and the formation of [({(Me(3)Si)(2)HC}-Ga(OH)(OCMe(3))(OOCMe(3))Li)(2)] (7), which was isolated in a low yield. Further composition gave the complete degradation of all peroxo groups with the formation of a relatively complicated Li(4)Ga(4)O(8) cage (8).
机译:用两当量叔丁基过氧化氢HOO处理[Li(H(2)Ga {CH(SiMe(3)(2)}(2))] 2 OEt(2)(12 OEt(2)) -CMe(3),得到有机过氧化镓[({(Me(3)Si)(2)HC}(2)Ga(OH)(OOCMe(3))Li)(2)](3)氧化过氧基团,使其与还原性Ga-C键紧密相连。二聚体式单元的锂原子由过氧化物的两个氧原子和两个羟基基团配位。即使施加了过量的H-O-O-CMe(3),也未观察到Ga-C键的断裂。取而代之的是分离了加合物[{(Me(3)Si)(2)HC}(2)Ga(OH)(OOCMe(3))(2)Li(2)(HOOCMe(3))](4) ,它具有完整的HOO-CMe(3)分子,末端与锂连接。发现化合物[(LiOOCMe(3))(2)(HOOCMe(3))(2)](5)具有相似的结构基序。三氢没食子酸酯[Li(H(3)Ga- {CH(SiMe(3))(2)})OEt(2)(2)产生独特的过氧化物[[{{Me(3)Si)(2) HC}-Ga(H)(OOCMe(3)(2)Li)(2)](6)在相似的条件下,除了过氧基团外还具有Ga-C甚至更具反应性的Ga-H键。它在室温下通过向Ga-H键中插入氧原子并形成[[{{Me(3)Si)(2)HC} -Ga(OH)(OCMe(3))(OOCMe( 3))Li)(2)](7),其产率低。进一步的组成使所有过氧基团完全降解,形成了一个相对复杂的Li(4)Ga(4)O(8)笼(8)。

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