51256-00-9Relevant academic research and scientific papers
Preparation method of 2,2'-biphenyldicarboxylic acid diallylester
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Page/Page column 4-5, (2019/06/08)
The invention provides a preparation method of 2,2'-biphenyldicarboxylic acid diallylester. The method comprises the following steps: step 1, mixing thionyl chloride with 2,2'-biphenyldicarboxylic acid at the mole ratio of (4 to 5) to 1, adding a catalyst, heating at the temperature of 100-120 DEG C and carrying out reflux reaction for 3-12 hours; step 2, mixing 2,2'-biphenyldicarbonyl chloride prepared in step 1 and allyl alcohol at the mole ratio of 1 to (2 to 3), heating to 100-110 DEG C, carrying out reflux reaction for 4-8 hours, washing until the pH of an aqueous phase is 6, and adding anhydrous magnesium sulfate for drying an organic layer; step 3, adding a polymerization inhibitor into an organic phase prepared by step 2, performing reduced pressure distillation for 1-5 hours to obtain a finished product of 2,2'-biphenyldicarboxylic acid diallylester. The catalyst is one or a combination of any two of N,N'-dimethylformamide and pyridine. The polymerization inhibitor is one of copper powder, cuprous chloride and hydroquinone.
Titanium isopropoxide promoted tandem self-cross and ring-closing metathesis approach for the synthesis of macrotetralides
Muthusamy, Sengodagounder,Azhagan, Datshanamoorthy
, p. 363 - 370 (2014/01/23)
A new approach is demonstrated for the synthesis of macrotetralides through an olefin metathesis reaction using Grubbs' second-generation catalyst with titanium isopropoxide as a cocatalyst. This study demonstrates a tandem self-cross and ring-closing metathesis approach to form macrocyclic ring systems with excellent (E) selectivity. The reaction was optimized with regard to functional group, catalyst, solvent, Lewis acid, concentration, and temperature. A new approach is demonstrated for the synthesis of macrotetralides through tandem self-cross and ring-closing metathesis reactions using Grubbs' second-generation catalyst and titanium isopropoxide. Copyright
Titanium Isopropoxide Promoted Tandem Self-Cross and Ring-Closing Metathesis Approach for the Synthesis of Macrotetralides
Muthusamy, Sengodagounder,Azhagan, Datshanamoorthy
supporting information, p. 363 - 370 (2015/10/05)
A new approach is demonstrated for the synthesis of macrotetralides through an olefin metathesis reaction using Grubbs' second-generation catalyst with titanium isopropoxide as a cocatalyst. This study demonstrates a tandem self-cross and ring-closing metathesis approach to form macrocyclic ring systems with excellent (E) selectivity. The reaction was optimized with regard to functional group, catalyst, solvent, Lewis acid, concentration, and temperature. A new approach is demonstrated for the synthesis of macrotetralides through tandem self-cross and ring-closing metathesis reactions using Grubbs' second-generation catalyst and titanium isopropoxide.
Formation of cyclopent[a]indene and acenaphthylene from allyl esters of biphenyl mono- and di-carboxylic acids and from biphenyl dicarboxylic anhydrides on flash vacuum pyrolysis at 1000-1100°C
Bapat, Jayant B.,Brown, Roger F.C.,Bulmer, Glenn H.,Childs, Trevor,Coulston, Karen J.,Eastwood, Frank W.,Taylor, Dennis K.
, p. 1159 - 1182 (2007/10/03)
Flash vacuum pyrolysis at 1000-1100°C of the allyl esters of the three isomeric biphenylcarboxylic acids, of the allyl esters of the 12 biphenyldicarboxylic acids and of the three biphenyldicarboxylic anhydrides gave pyrolysates which were examined by 1H n.m.r. spectroscopy at temperatures below -50°C. In all cases the spectra showed the presence of cyclopent[a]indene and acenaphthylene together with other products. Possible mechanisms for these ring contraction and cyclization processes are discussed and the results of pyrolyses of [2,3-13C2]biphenyl-2,3-dicarboxylic anhydride, and [3,4-13C2]-and (2-2H1)-biphenyl-3,4-dicarboxylic anhydrides are reported.
