Alkylation of phenols

Claim 1

THE PROCESS OF INTRODUCING A SINGLE ALKYL GROUP INTO A PHENOL WHICH COMPRISES CONTACTING A PHENOL AND AN OLEFIN IN THE PRESENCE OF NORMAL PENTANE AS A DILUENT AND IN THE PRESENCE OF A CATALYST CONSISTING OF THE PRODUCT RESULTING FROM THE SATURATION OF CONCENTRATED AQUEOUS ORTHOPHOSPHORIC ACID CONTAINING FROM 70 TO 90% H3PO4 WITH BORON FLUORIDE, MAINTAINING THE RESULTING MIXTURE AT A TEMPERATURE OF FROM 85 TO 120* F. AT A PRESSURE ALLOWING BOILING OF THE REACTION MIXTURE, WHILE MAINTAINING THE OLEFIN CONCENTRATION BELOW 5 WEIGHT PER CENT IN THE REACTION MIXTURE AND THEREBY EFFECTING INTRODUCTION OF A SINGLE ALKYL GROUP CORRESPONDING TO SAID OLEFIN INTO THE BENZENE NUCLEUS OF SAID PHENOL AS THE PRINCIPAL REACTION, AND RECOVERING THE RESULTING PRODUCT CONTAINING ONE INTRODUCED ALKYL GROUP IN AN AMOUNT IN EXCESS OF 50 PER CENT OF THE THEORETICAL YIELD.