boron trifluoride diethyl etherate in chloroform T=61°C; Acylation; 4 h;

in chloroform; N,N-dimethyl-formamide 5 h; Ambient temperaturetransformation of various steroidal tetrahydropyranyl ethers to acetates with acetyl chloride in aprotic solvents; Product distribution;

poly(4-vinylpyridinium) p-toluenesulfonate in tetrahydrofuran; ethanol T=75°C; Hydrolysis; 40 h;

aluminium trichloride; silver(I) bromate in acetonitrile 3 h; Heating;