ChemInform Abstract: Synthesis of Fused Carbazoles by Gold-Catalyzed Tricyclization of Conjugated Diynes via Rearrangement of an N-Propargyl Group.

ChemInform ◽  
2016 ◽  
Vol 47 (19) ◽  
Author(s):  
Masamitsu Taguchi ◽  
Yusuke Tokimizu ◽  
Shinya Oishi ◽  
Nobutaka Fujii ◽  
Hiroaki Ohno
Keyword(s):  
Conjugated Diynes

The reactions of linear conjugated diynes with Dicarbonyl(η-cyclopentadienyl)- cobalt and -rhodium

1975 ◽  
Vol 28 (2) ◽  
pp. 285 ◽  
Author(s):  
RS Dickson ◽  
LJ Michel
Keyword(s):  
Thermal Degradation ◽  
Aromatic Compound ◽  
Substituted Benzenes ◽  
Polycyclic Aromatic Compound ◽  
Organic Products ◽  
Polycyclic Aromatic ◽  
Alkyne Complexes ◽  
Conjugated Diynes

The reactions of (η-C5H5)Co(CO)2 with the diynes hexa-2,4-diyne and 1,4- diphenylbutadiyne give three isomers of the cyclopentadienone complexes (C5H5)Co[(RC2C2R)2CO], R = Me or Ph, and two isomers of the tris-alkyne complexes (C5H5)2Co2(RC2C2R)3CO, R = Me or Ph. Organic products of formula (RC2C2R)3, R = Me or Ph, (MeC2C2Me)5, and (PhC2C2Ph)3CO have been isolated also. Two isomers of (RC2C2R), were separated and were identified as the 1,2,4-(R)3-3,5,6-(C2R)3- and the 1,3,5-(R)3-2,4,6-(C2R)3-benzenes. The compound (PhC2C2Ph)3CO is believed to be tris(phenylethynly)triphenylcycloheptatrienone, and (MeC2C2Me)5 is probably a polycyclic aromatic compound. Thermal degradation of the complexes (C5H5)2CO2(RC2C2R)3CO gives the substituted benzenes (RC2C2R)3. ��� The reaction of (η-C5H5)Rh(CO)2 and hexa-2,4-diyne gives the cyclopentadienone complex(C5H5)Rh[(MeC2C2Me)2CO] and the cycloheptatrienone complex (C5H5)Rh[(MeC2C2Me)3CO].Two isomers of the substituted benzene (MeC2C2Me)3 were obtained also.

SYNTHESIS OF ASYMMETRIC DIYNES, DIFFERING IN NUMBER OF METHYLENE FRAGMENTS AND THEIR ABILITY TO SOLID STATE POLYMERIZATION

1970 ◽  
Author(s):  
Boris S. Tanaseichuk ◽  
Margarita K. Pryanichnikova ◽  
Alexey A. Burtasov
Keyword(s):  
Solid State ◽  
Uv Irradiation ◽  
Triple Bond ◽  
Color Change ◽  
Sodium Ethoxide ◽  
Polymerization Process ◽  
Solid State Polymerization ◽  
Bright Color ◽  
Two Stages ◽  
Conjugated Diynes

Asymmetric conjugate diynes are of considerable interest because of their ability to solid state polymerization to form polymers with an ordered tough polyene structure. The capacity of conjugated diynes to such polymerization is determined by the presence and nature of the substituents in the side chain diynes and the degree of their distance from the diacetylenic fragment. To evaluate the effect of the distance a bulky substituent of conjugate diyne′s fragment for ability of asymmetric diacetylenes ordered solid state polymerization were prepared 4 alkildiinil′s ether of p-hydroxybenzaldehyde with varying degrees of distance diyne′s fragment from the benzene ring.Synthesis of alkildiinil′s esters of p-hydroxybenzaldehyde was carried out in two stages. At the first stage by alkylation of p-hydroxybenzaldehyde of corresponding of toluenesulfonate′s terminal alkynol or ω-bromalkines in the presence of sodium ethoxide was prepared monoalkinil′s ether of p-hydroxybenzaldehyde, in which the terminal triple bond is separated from the phenoxyl′s fragment 1, 2, 3 and 4 methylene′s groups. Use as a alkylating agent of toluenesulfonate′s terminal alkynols, which differ in low volatility compared ω-bromalkines, gives a fairly high (~ 60%) the yield of desired products. At the second stage according to the method of Kadio-Chodkiewich the condensation-3-brompropin-2-ol with the corresponding monoalkinil′s esters of p-hydroxybenzaldehyde were alkildiynil′s ethers of p-hydroxybenzaldehyde, which have a terminal triple bond is separated from the benzene′s ring 1, 2, 3 and 4 methylene′s groups. The effect of the degree of remoteness of the conjugate diyne′s fragment from the bulk p-formilfenoksil′s substituents on these compounds ability to solid state polymerization under UV irradiation was studied by the asymmetric diynes. About the polymerization rate was judged visually by a color change. All investigated diynes exhibited the ability to solid state polymerization. The rate of it was largely dependent of the number of methylene′s fragments, separating p-formilfenoksil′s ring from diyne′s fragment. If the irradiation of diynes containing 3 or 4 methylene′s fragments, color change of almost colorless to dark brown occurred within 5-6 h, then diynes containing 1 or 2 of the methylene′s fragments was required for 24 h. It goes to show that the increase the length of the methylene′s chain, postpones surround p-formilfenoksil′s fragment from a paired diyne′s fragment, eases  the solid state polymerization. However, the absence of the bright color of the polymer characteristic polydiacetylene′s ordered structures indicates that, polymerization was not well-ordered in out case.Thus, the results showed that administration of methylene′s fragments, causing varying degrees of remoteness of the conjugate diyne′s fragment from the bulk p-formilfenoksil′s fragment, has a significant impact on the ability of asymmetric conjugate diynes to solid state polymerization under UV irradiation. The increase in the degree of remoteness promotes their solid state polymerization, those namely the structure of asymmetric diynes determines their behavior in the polymerization process.

Versatile Behavior of Conjugated Diynes with Zirconocene Reactive Species

2009 ◽  
Vol 28 (1) ◽  
pp. 181-187 ◽  
Author(s):  
Stéphane Bredeau ◽  
Esteban Ortega ◽  
Geneviève Delmas ◽  
Philippe Richard ◽  
Roland Fröhlich ◽  
...  
Keyword(s):  
Reactive Species ◽  
Conjugated Diynes

Zirconium catalyzed CC bond formation reaction of conjugated diynes with EtMgBr

1993 ◽  
Vol 34 (51) ◽  
pp. 8301-8304 ◽  
Author(s):  
Tamotsu Takahashi ◽  
Koichiro Aoyagi ◽  
Victor Denisov ◽  
Noriyuki Suzuki ◽  
Danièle Choueiry ◽  
...  
Keyword(s):  
Bond Formation ◽  
Formation Reaction ◽  
Conjugated Diynes

Steric Effects in Reactions of Decamethyltitanocene Hydride with Internal Alkynes, Conjugated Diynes, and Conjugated Dienes

2014 ◽  
Vol 33 (13) ◽  
pp. 3399-3413 ◽  
Author(s):  
Jiří Pinkas ◽  
Róbert Gyepes ◽  
Ivana Císařová ◽  
Jiří Kubišta ◽  
Michal Horáček ◽  
...  
Keyword(s):  
Conjugated Dienes ◽  
Steric Effects ◽  
Internal Alkynes ◽  
Conjugated Diynes
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