“…2 R 3SnNa + F -(S iM e 2) " -F -2 NaF R3Sn -(SiM e2)" -SnR 3 2c-e, 2h-k R = Me, Ph; n = 1 -6 (2) W ä h re n d sich F lu o rsilan e zu r H e rste llu n g d e r V er b in d u n g e n 2 als b e so n d e rs g ee ig n e t erw ie sen , ist zu r S y n th ese von 1 die V erw en d u n g v o n C h lo rsila n e n e rfo rd e rlic h , da b eim E in sa tz von flu o rie rte n S ilan en als R e a k tio n s p a rtn e r fü r die L ith iu m h yd rid o s ta n n id e (L iS n (H )R 2) ein e S i-S n -B in d u n g sk n ü p fu n g n u r zu m axim al 20% b e o b a c h te t w ird. M an e rh ä lt sta tt dessen a ,w -d ih y d rie rte S ilane als H a u p tp ro d u k te (> 8 0 % ), u n d s ta tt e in e r S i-S n -B in d u n g sk n ü p fu n g w ird ein e H y d rie ru n g als K o n k u rre n z re a k tio n b e o b a c h te t. D ie U rs a c h e n fü r d iese R e a k tio n sind w eitg e h e n d u n g e k lä rt.…”
Section: Ergebnisse Und Diskussionunclassified
“…Im H in b lick a u f eig en e U n te rs u c h u n g e n zu r D a rste llu n g u n d zum R e a k tio n s v e rh a lte n v o n S tan n y lo lig o silan en [ 1 -3 ] in te re s s ie rte n uns b e so n d e rs die b ish e r u n b e k a n n te n a,co-distanny lsu b - (1,2) des Typs R 'R 2S n -( S iM e 2) " -S n R 2R ' (n = 1 -6 ) , b e ric h te t. A u fg ru n d d e r d eu tlic h g erin g eren B in d u n g se n e r gie v o n S i-S n -B in d u n g e n im V ergleich zu S n -C -B in d u n g e n galt es e in e n R e ak tio n sw eg zu fin d en , b ei d e r sich ein e S i-S n -B in d u n g ssp a ltu n g als K o n k u rre n z re a k tio n zu r H alo g e n ie ru n g am Z in n a to m v e rm e id e n läßt.…”
Stannyloligosilanes 1 and 2 with terminal organotin groups are available by reacting alkali metal tri- or diorganostannides with α,ω-dichloro- or difluorosilanes, or by treatment of organochlorostannanes with α,ω-difluorosilanes in the presence of magnesium . Attempts to functionalize the triorganotin derivatives 2 by halogenation reagents did not result in the halogen compounds 5; instead cleavage of silicon-tin bonds is observed. In contrast, reactions of the hydridotin derivatives 1 with CHX3 (X = Cl, Br) lead to the quantitative formation of the bis(chloro- or bromostannyl)oligosilanes 5. A ll compounds were characterized by NMR, IR, MS and elemental analysis. In addition, the triorganotin compound 2i and the hydridotin species 1b have been characterized by X-ray crystallography.
“…2 R 3SnNa + F -(S iM e 2) " -F -2 NaF R3Sn -(SiM e2)" -SnR 3 2c-e, 2h-k R = Me, Ph; n = 1 -6 (2) W ä h re n d sich F lu o rsilan e zu r H e rste llu n g d e r V er b in d u n g e n 2 als b e so n d e rs g ee ig n e t erw ie sen , ist zu r S y n th ese von 1 die V erw en d u n g v o n C h lo rsila n e n e rfo rd e rlic h , da b eim E in sa tz von flu o rie rte n S ilan en als R e a k tio n s p a rtn e r fü r die L ith iu m h yd rid o s ta n n id e (L iS n (H )R 2) ein e S i-S n -B in d u n g sk n ü p fu n g n u r zu m axim al 20% b e o b a c h te t w ird. M an e rh ä lt sta tt dessen a ,w -d ih y d rie rte S ilane als H a u p tp ro d u k te (> 8 0 % ), u n d s ta tt e in e r S i-S n -B in d u n g sk n ü p fu n g w ird ein e H y d rie ru n g als K o n k u rre n z re a k tio n b e o b a c h te t. D ie U rs a c h e n fü r d iese R e a k tio n sind w eitg e h e n d u n g e k lä rt.…”
Section: Ergebnisse Und Diskussionunclassified
“…Im H in b lick a u f eig en e U n te rs u c h u n g e n zu r D a rste llu n g u n d zum R e a k tio n s v e rh a lte n v o n S tan n y lo lig o silan en [ 1 -3 ] in te re s s ie rte n uns b e so n d e rs die b ish e r u n b e k a n n te n a,co-distanny lsu b - (1,2) des Typs R 'R 2S n -( S iM e 2) " -S n R 2R ' (n = 1 -6 ) , b e ric h te t. A u fg ru n d d e r d eu tlic h g erin g eren B in d u n g se n e r gie v o n S i-S n -B in d u n g e n im V ergleich zu S n -C -B in d u n g e n galt es e in e n R e ak tio n sw eg zu fin d en , b ei d e r sich ein e S i-S n -B in d u n g ssp a ltu n g als K o n k u rre n z re a k tio n zu r H alo g e n ie ru n g am Z in n a to m v e rm e id e n läßt.…”
Stannyloligosilanes 1 and 2 with terminal organotin groups are available by reacting alkali metal tri- or diorganostannides with α,ω-dichloro- or difluorosilanes, or by treatment of organochlorostannanes with α,ω-difluorosilanes in the presence of magnesium . Attempts to functionalize the triorganotin derivatives 2 by halogenation reagents did not result in the halogen compounds 5; instead cleavage of silicon-tin bonds is observed. In contrast, reactions of the hydridotin derivatives 1 with CHX3 (X = Cl, Br) lead to the quantitative formation of the bis(chloro- or bromostannyl)oligosilanes 5. A ll compounds were characterized by NMR, IR, MS and elemental analysis. In addition, the triorganotin compound 2i and the hydridotin species 1b have been characterized by X-ray crystallography.
“…The four-, five-, and six-membered rings C − E were obtained in a stepwise manner by starting from α,ω-bis(di- tert -butylhydridostannyl)silanes followed by halogenation and ring closure metathesis with magnesium . One-pot reactions of halosilanes with chlorostannanes and magnesium yielded six-, seven-, and eight-membered Si−Sn rings of type E − H (Chart ), indicating that this synthetic route should also be applicable to the synthesis of bicyclic stannasilanes .…”
Section: Introductionmentioning
confidence: 99%
“…However, in rather complex amine-catalyzed bond cleavage−coupling reactions, only monocyclic Si−Sn derivatives were accessible. During the last few years we also reported a number of novel monocyclic compounds exclusively containing tin and silicon atoms in the ring skeleton (Chart ) in order to investigate the influence of organostannyl groups on the properties of cyclic oligosilanes. , 1 Examples for Monocyclic Six- and Seven-Membered Stannasilanes (R = Me, t -Bu, Ph) …”
The mixed heteroadamantanes Si6Ge4 and Si6Sn4 are readily accessible from Me2ECl2/Si2Cl6/cat. Cl– (4 × EMe2, 2 × SiCl2, 4 × Si–SiCl3 vertices; E = Ge, Sn). Different from Si6Ge4, two...
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