| 摘要 |
An onium salt represented by formula (1) (In the formula: A- represents an anion; and the remainder of the formula represents a quaternary onium cation (therein, Q+ represents a nitrogen cation or a phosphorous cation; R1-R3 represent C1-6 alkyl groups, and the terminals of R1 and R2 may bond to form a pyrrolidine ring, a piperidine ring, a pyridine ring, a phosphorane ring, a phosphorinane ring or a phosphorin ring; if a pyridine ring or a phosphorin ring is formed then R3 will not be present; R4 represents a C1-4 alkyl group; D represents CH2, CH(CH3) or CH(CH3)CH2; E represents NH or a sulfur atom; m is an integer in the range of 0-3, and n is an integer in the range of 1-4). |
