Novel phosphorsulfide derivatives of {TAIL ~ deoxynucleosides} or deoxynucleotides are provided, which have the general formula: ##STR1## wherein R1 is a hydroxy protecting group; R2 is a phosphate protecting group; R3 is an aryl group; B1 and B2 may be the same or different and each are {HEAD ~ a base residue} which may have a protecting group; and n is zero or a positive integer, provided that if n is 2 or larger, the respective R2 may be the same or different 
Novel phosphorsulfide derivatives of { TAIL ~ deoxynucleosides } or deoxynucleotides are provided , which have the general formula : # # STR1 # # wherein R1 is a hydroxy protecting group ; R2 is a phosphate protecting group ; R3 is an aryl group ; B1 and B2 may be the same or different and each are { HEAD ~ a base residue } which may have a protecting group ; and n is zero or a positive integer , provided that if n is 2 or larger , the respective R2 may be the same or different
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH