1151-1152). Prior to the synthesis of aspartame from two α-amino acids, L-phenylalanine (orange on the image) is treated with methanol (blue on the image) in the presence of hydrochloric acid. This causes an esterification reaction, forming the methyl ester of phenylalanine. The bond
Chapter Two: Literature review Introduction English as a second or foreign language has gained much attention during the past decades in almost every country. In Iran English is taught as a foreign language in high-schools as well as in universities (Mirdehghan, HoseiniKargar, Navab, & Mahmoodi, 2011). Aside from different language courses presented in different levels of public academic centers, there are also private institutes that teach different levels of foreign language