LTSS BTWN AN MLG CLBING AND 1 DSNDING.

Narrative

I WAS THE RADAR CTLR AT OAKLAND SECTOR 15 AND WAS GETTING BUSY WHEN HDOFS WERE TAKEN ON 4 ACFT LNDG SJC. WE WERE IN A 20 MI IN TRAIL PERIOD TO SJC AND THESE ACFT WERE IN NO WAY SEQUENCED. THERE WAS XING TFC AT THE SAME ALTS; AS THE ARRS AND THESE (SJC BOUND) ACFT WERE BEING DSNDED AND 'S-TURNED' FOR SPACING. A HANDOFF WAS TAKEN ON AN ACFT MLG X WHICH HAD DEPARTED SMF AND WAS AT A TEMPORARY ALT OF FL270. MLG X WAS CLBED TO FL330 TO FACILITATE THE DSCNT OF THE SJC BOUND ACFT AND MLG X WAS VECTORED SBOUND FOR TFC AT FL330. MLG Y INBOUND TO SJC WAS ON A VECTOR FOR SPACING AND LEVEL AT FL330. THE POTENTIAL CONFLICT WAS SEEN AND I IMMEDIATELY TURNED MLG Y TO A 250 HDG AND EXPEDITED DSCNT AND TURNED MLG X TO A 075 HDG AND EXPEDITED CLB. TURNS AND ALT CHANGES WERE NOT TIMELY AND SEPARATION WAS LOST. CONFLICT ALERT DID NOT GO OFF. I FEEL THAT THE FACTOR WHICH MADE THIS A COMPLICATED TFC SITUATION WAS THE VECTORING THAT WAS REQUIRED TO GET THE REQUIRED IN TRAIL SPACING ON SJC ARRS; 2 OF WHICH HAD BEEN TAKEN OFF THE PREFERENTIAL RTING WITHOUT APPREQ.