1 Ketenes, notably dimethyl ketene, readily undergo oligomerization and polymerization.

2 AKD (alkyl ketene dimer) emulsions offered good sizing, but rendered very poor ink hold-out.

3 Isopropenyl acetate was synthesized from ketene and acetone by direct esterification using strong acidic cation-exchange resin to substitute H2SO4 as catalyst.

4 Oxo ketene dithioacetals 1 are a kind of versatile intermediates in organic synthesis.

5 The inclusion of polyamide and alkyl ketene dimmer improved the mechanical properties of methylcellulose, especially the wet tensile strength. Testing of biodegradation activity showed that both St.

6 The structure of heterocyclic ketene aminals is peculiar and notable which possesses a large conjugation system in its molecule.

7 The effects of acylating agents, acetic anhydride and ketene on synthesis of linalyl acetate from linalool were studied.

8 The results show that the compound maybe 6-acetoxy-4, 6-dimethyl-2,[]4-cyclohexadienone or the isomers of cyclic ketene.

9 Depending upon reaction conditions, the product may be a polyketone formed by addition polymerization of the ketene double bond.

10 The synthesis of chloroacetyl chloride by the chlorination of ketene was studied in the article.