CCL: calculation of logP using atom contribution

[Loan Huynh <huynhkl2000{}yahoo.ca>]

Dear CCL,

I am currently calculating the logP values using the atom contribution by Grosh and Crippen ( J. Computational Chemistry, 1988, 9, p.80-90).

 

I have done quite a lot of searching on calculating the oxidation state of carbon. However, I have trouble calculating the formal oxidation number of various hybridization carbons.  For example, for H attached to sp carbon, I cannot obtain the formal charge of 3 for sp carbon. 

 

Is there any document that shows the calculation of oxidation number for sp carbon? 

 

Thank you very much for your help,

 

Loan