4828-84-6

Upstream product

• 15570-45-3 1,2,3,4-tetraphenylcyclopentadiene 
• 479-33-4 2,3,4,5-tetraphenylcyclopenta-2,4-dienone 
• 32729-47-8 2,3,4,5-tetraphenylcyclopentadiene hydrazone 

Downstream Products

• 54251-82-0 1,2-Dimethyl-4,5,6,7-tetraphenyl-spiro[2.4]hepta-1,4,6-triene 
• 16252-25-8 1.2.2-Trimethyl-4.5.6.7-tetraphenyl-spiro<2.4>heptadien-(4.6) 
• 54251-83-1 1,2-Diethyl-4,5,6,7-tetraphenyl-spiro[2.4]hepta-1,4,6-triene 
• 16252-15-6 5-Cyclohexyl-1.2.3.4-tetraphenylcyclopentadien-(1.3) 
• 16252-17-8 5--1.2.3.4-tetraphenylcyclopentadien-(1.3) 
• 16252-29-2 2'.3'.4'.5'-Tetraphenylbicyclo<5.1.0>octan-8-spiro-1'-cyclopentadien-(2'.4') 
• 26439-15-6 1,2,3,4-Tetraphenyl-5,8-dimethyl-7H-benzocycloheptatrien 
• 15097-02-6 1-Chlor-2.3.4.5-tetraphenyl-cyclopentadien 
• 33924-69-5 1-Brom-2,3,4,5-tetraphenylcyclopentadien 
• 16342-71-5 2-Methyl-2-ethyl-4.5.6.7-tetraphenyl-spiro<2.4>heptadien-(4.6) 
• 4995-66-8 5-Acetoxy-1,2,3,4-tetraphenylcyclopenta-1,3-diene 
• 13975-99-0 7-<2.3.4.5-Tetraphenyl-cyclopentadien-(2.4)-yl-(1)>-cycloheptatrien-(1.3.5) 
• 37642-03-8 4,5,6,7-Tetraphenyl-spiro[2.4]hepta-1,4,6-triene-1-carboxylic acid methyl ester 
• 35160-47-5 N-phenyl-1,2,3,4-tetraphenylcyclopentadienone ketoxime 

Relevant academic research and scientific papers

Cyclopentadienylidenephosphinazines

Diazocyclopentadienes which are not alkyl- or aryl-substituted at both the 2- and 5-positions react readily with triphenylphosphine to form cyclopentadienylidenephosphinazines. If both of these positions are so substituted phosphinazines are not formed. A phosphinazine was obtained from 2-chloro-3,4,5-triphenyldiazocyclopentadiene while its 2-nitro-analogue apparently formed a readily hydrolysed phosphinazine. Diazotetraphenylcyclopentadiene formed a phosphinazine with tri-n-butylphosphine. The reasons for these differences in reactivity are discussed. When heated to higher temperatures some of the phosphinazines decomposed with loss of nitrogen to give phosphonium cyclopentadienylides. Electron-withdrawing substituents in the five-membered ring make the phosphinazines susceptible to ready hydrolysis to cyclopentadienone hydrazones. Cyclopentadienylidenephosphinazines are protonated by mineral acids on nitrogen rather than on the cyclopentadiene ring.