Deca-l,9-diene

CM of 1,9-decadiene with an excess of trialkoxy- and trisiloxy-substituted vinylsilanes results in the formation of , -l,10-bis(silyl)deca-l,9-dienes (Eq.37) [67],... 

Bicyclo 7.1.0 deca-l, 7-diene 1458 Bicyclo 7.1.0 deca-2,3-diene 2407 Bicyclo 7,l,0 deca-4,5-diene 2406,2663 Bicyclo S.3.0 deca-l,9-diene 2642 Bicyclo 5.3,01deca-1 ,8-diene 2642 Bicyclo 4,4,0 deca-I ,2-diene 2409 Bicyclo 4,l, 0 heptane 7-(Propylidene)- 1447 Bicyclo 4.1,0 hept-2-ene... 

Various LC-PB-MS and LC-APCI-MS comparisons have been reported on polymer additive extracts [540, 563,629,630]. The complementary character of the El and APCI modes was confirmed. Yu et al. [630] compared LC-PB-MS and RPLC-UV-APCI-MS for detection and identification of unknown additives (in the 252 to 696 Da range) in an acetonitrile extract from PP (containing Irganox 1076, Naugard XL-1 and a degradation product, NC-4, 3-(3,5-di-f-butyl-4-hydroxyphenyl) propanoic acid, 7,9-di-f-butyl-l-oxaspiro [4,5] deca-6,9-diene-2,8-dione and octadecanol-1). Comparison was based on El data (identification of chemical structure), APCI (MW information CID spectrum with limited fragmentation) and PDA (210 nm). The components were identified by El and confirmed by APCI- (with better sensitivity and linearity) MS and PDA showed... 

The l,7-dioxaspiro[4,5]deca-3,9-diene 11 can be prepared by both a double RCM and by sequential single RCMs (Scheme 5) . 

Rhodium(I)-catalysed Pauson-Khand reaction of allenynes has been shown to be applicable for constructing azabicyclo[5.3.0]decadienone and oxabicyclo[5.3.0] decadienone frameworks. The 10-monosubstituted-bicyclo[5.3.0] deca-l,7-dien-9-one ring system has been prepared by the rhodium(I)-catalysed Pauson-Khand reaction of allenynes under 10 atm of CO (Scheme 86).129... 

Allyl-5-isopropyl-3,6-dimethoxy-2-(prop-2-ynyl)-2,5-dihydropyrazine (315) gave a separable mixture of 8-isopropyl-7,10-dimethoxy-2,3-dimethylene-6, 9-diazaspiro[4.5]deca-6,9-diene (316) and 3-isopropyl-2,5-dimethoxy-10-methylene-l,4-diazaspiro[5.5]undeca-l,4,8-triene (317) [Pd(OAc)2, PPh3, PhH, A, 20°C, 24 h 32 and 24%, respectively, after separation] also analogous reactions.1610... 

HricycIo 5.3,0.0J l0]dec-7-en 2,6-Di-methyl-10-methoxy-9-oxo- El7b, 1154 (4-OR —3-oxo-subt.-bicy-clo[4.4.0]deca-l, 4-dien/hv)... 

MO calculations have been carried out on the isomerization of cyclopropane to propene, and the MNDO method has been used to study the reaction pathway and to optimize the structure of reactant, transition structure, and product of the ring opening reaction of bicyclo[1.1.0]butane. Various methods have been employed to estimate the rate constants for ring opening of the 2-cyclopropyl-2-propyl radical. 1-Acceptor-1-sulfenyl-substituted 2-vinylcyclopropanes of the type (430) have been found to afford 6-sulfenyl-a,jS y, -unsaturated carboxylic esters and nitriles (431) upon treatment with acid, by a process which involves C(l)—C(2) bond fission and a novel 1,5-sulfenyl rearrangement (see Scheme 110). It has been shown that the benzophenone-sensitized photolysis of vinyl norcaradiene derivatives, such as 5-(2-methylprop-l-enyl)-3-oxatricyclo[4.4.0.0 ]deca-7,9-dien-4-ones (432), results in the regioselective cleavage of only one of the cyclopropyl c-bonds to afford isochroman-3-one derivatives (433). It has been reported that the major product obtained from the reaction of structurally diverse a-diazo ketones with an electron-rich alkene in the... 

Analogously, irradiation of 7-azabicyclo[4.2.2]deca-2,4,9-trien-8-one (11) in methanol solution at 25 °C with an unfiltered Hanovia Type L 430-W mercury arc for 4.5 hours afforded the isomeric lactam, 4-azatricyclo[3.3.2.0 ]deca-6,9-dien-3-one (12) in 54% yield. Its structure was estabished by conversion to methoxyazabullvalene 14 in 92% yield on treatment with trimethyloxonium tetrafluoroborate. An improved preparation of 3-methoxy-4-azatricyclo-... 

When bicyclopropylidene was treated in the same way only trimers of the initially formed 8,9-diazadispiro[2.0.2.4]deca-7,9-diene were isolated.The cycloaddition reaction of the unsym-metrical dimethyl 3-cyano-l, 2,4-triazine-5,6-dicarboxylate with methylenecyclopropane was re-gioselective. The primary product was the 2-cyanospiro-3,4-dihydropyridine system (with C3 as spirocenter) which hydrolyzed readily upon chromatography. Dimethyl 4-oxo-5-aza-spiro[2.5]oct-5-ene-6,7-dicarboxylate was isolated as a stable product in 8%> yield. ... 

Use of acetone/water, in place of methanol, led to the formation of (Z,Z)-l,6-dibromocyclo-deca-l,6-diene-c -5,9-diol. ... 

Methylene-l,4-dioxaspiro-[4,5]deca-6,9-diene, another cyclic acetal, has been found to undergo the selective R-ROP to a polyarylene ether regardless of the small ring strain. This is due to the formation of a stable aromatic ring as the driving force (55). 

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