Hello! I need something about following things. It is very important to me:

1. Oxidation of carboxylic acids to chinones with presence of diiode pentaoxide (I2O5), potassium peroxodisulphate (K2S2O8), potassium permanganate (KMnO4) or potassium dichromate (K2Cr2O7);

2. Iodation. Inserting of iodium to the hydroxochinaldine acids ring by using diiode pentaoxide (I2O5);

3. Sulfuration of hydroxochinaldine acids by using tetraphosphorus decasulphide (P4S10);

4. Anything about Lawesson reagents.

I rely on your help because it is a very important case to me.
My e-mail: djds@poczta.onet.pl
Thanks a lot!

How to use I2O5 read from:
J. Org. Chem. 61 (1996) 9621-2
JCS Perkin2, 1988, 933-6
http://pages.unibas.ch/mdpi/ecsoc-4/a0004/a0004.htm