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E X 4 4QD, (,reat Uritaiii (12 V I I I 76)Summary. The crystal structurc of (1, 1'-fcrrocenediy1)diphcnylsilane Iias been determined from analysis of photographic X-ray data. The crystal system is orthorhoinbic, a = 14.18 (2)

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A modified Friedel-Crafts synthesis has been used to make a variety of aromatic ether-ketone-')(' (EKX) polymers. The 'X' groups incorporated were: imide, amide, sulphone, ester, azo, quinoxaline, aliphatic, fluoroaliphatic and fluoroaromatic. Some properties of these EKX polymers are reported and discussed.