Dear Fa Najafi,

The following links and attached files illustrate the different catalysts used in acylation reactions:

http://www.organic-chemistry.org/synthesis/C1O/esters/acylations.shtm

http://www.organic-chemistry.org/namedreactions/friedel-crafts-acylation.shtm

Hoping this will be helpful,

Rafik

acetalisation typically done under anhydrous acidic conditions, 

If the reaction is not proceeding well, you could remove the water formed to drive the reaction forward, e.g. Dean-stark, molecular sieves, or triethylorthoformate (react with water).

Camphorsulfonic acid, amberlite resin etc all works too

Try to do reaction using acetic anhydride only.

N-acetyl or O-acetyl, Please drop me into email:[email protected].

Take a compound in pyridine, add catalytic amount of 4-DMAP then acetic anhydride usually 5 to 6 equivalents stir the reaction mass until completion.

After completion by TLC pour the reaction mass into cold water(0o-5oC) slowly.

Best of luck!!

Acetals are formed when two molecules of  any alcohol react with one molecule of an aldehyde and this can be represented by the following general equation.

R-CHO  +  2 R1-OH  -------->   R- C(OR1)2H  +  H2O

I agree with what Yang has mentioned earlier. The above-mentioned reaction is an equilibrium reaction and hence removal of water from the reaction system will surely drive the process to the acetal side.   

 In the following link you will find a downloadable article describing reusable catalyst for carbonylvacetalyzation based on modified bentonite:

http://file.scirp.org/pdf/JASMI_2013102213400790.pdf