ARTCC CTLR DSNDED AN LTT THROUGH THE ALT OF ANOTHER WITHOUT STANDARD SEPARATION.

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I ATTEMPTED TO DSND AN ACFT THROUGH THE PATH OF ANOTHER ACFT. WHEN I SAW THAT THE DSCNT PROFILE WAS NOT ENOUGH TO MAINTAIN SEPARATION I TURNED THE FIRST ACFT. I THEN DETERMINED THAT THIS TURN WOULDN'T BE ENOUGH TO MAINTAIN SEPARATION; I CALLED THE SECOND ACFT INVOLVED. THE SECOND ACFT DID NOT RESPOND SO I ATTEMPTED TO CALL AGAIN. I THEN CALLED THE FIRST ACFT AND LEARNED THAT THE PLT HAD BEEN ATTEMPTING TO CALL ME AND WAS STEPPING ON MY XMISSIONS TO THE SECOND ACFT. SUPPLEMENTAL INFO FROM ACN 193208. LTT X LGA .1. MERIT HFD V229 GDM .1. MHT AT 15000; SO OF HFD GIVEN DIRECT GDM. LTT Y PLB .1. V130 ORW V308 BOROS-CCC-ISP AT FL190. LTT X WAS POINTED OUT TO ZBW SECTOR 07 AT 15000 DSNDING TO 11000 MOMENTARILY. LTT Y ALSO POINTED OUT TO ZBW SECTOR 07 DSNDING TO 11000 AND GIVEN DSCNT. LGT Y INITIAL RATE OF DSCNT OBSERVED TO BE 1500 FPM THEN INCREASED SLIGHTLY. LTT Y WITH AN ACR (20 MIT DSNDING PVT) POINTED OUT TO ZBW SECTOR 34. ZBW SECTOR 34 APPROVED POINT OUT. ACR TOOK RADAR CONTACT WITH LTT Y DSNDING TO 12000. LTT Y ISSUED AMENDED ALT AND GIVEN RV 20 DEG L OF COURSE. LTT X ISSUED TURN 50 DEG L OF COURSE 3 TIMES; TURN WAS NOT ACKNOWLEDGED.