Crosslinked polymers of improved properties compared to those of pure polystyrene, are obtained by the thermal or radical copolymerization of styrene with 1,3,5‐triisopropenylbenzene. The copolymers are transparent glassy solids, practically insoluble in most organic solvents and easily machineable. They decompose at about 350°C. Copolymers containing 5–30% of 1,3,5‐triisopropenylbenzene exhibit the better properties.

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Die ungesättigten Alkohole (I) werden beim Rückflußkochen in Petroläther (PÄ) oder einem anderen geeigneten Lösungsmittel (ohne Lösungsmittel verläuft die Reak tion nach einer längeren Induktionsperiode bei Raumtemperatur stürmisch bis explosiv) in Gegenwart des Bis(tri‐n‐butylphosphin)‐NiBrz‐Komplexes zu den Benzolderivaten (II) trimerisiert.

When heated under reflux in toluene in the presence of [ (Bu",P),NiBr,],2.5-dimethyIhex-3-yne-2.5-diol is not converted into the expected simple polymerization product. X -Ray structural analysis shows the novel product to be 1 '-(1,3-dihydro-7-isopropenyl-6-isopropyl-l,1,4,4-tetramethylfuro[3,4-c] pyran-3-ylidenemethyl) -1.3-dihydro-7-isopropenyl-6-isopropyl-l,1,4,4,5',5'-hexamethylfuro[3,4-c] pyran-3-spiro-3'-cyclohexene, in agreement with other physical data. The same product was obtained with [(Ph,P), NiBr,] as catalyst. Crystals are monoclinic, a = 9.32(1), b = 37.26(3), c = 13.18(1)A, = 118.7(1)", Z = 4, space group P2,lc. The structure was solved from diffractometer data by direct methods and refined to R 0.054 for 3 583 observed reflections.

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