Jul.  21, 2016  25  US 2016/0209749 Al  substituted with the above-described group) represented by  Ra  include the same groups as those of the specific examples  described for R$_{6}$ .  [0403]  Specific examples of a particularly preferable com› pound (C) in the present invention include the compound  disclosed in paragraph "0475" of US2012/0135348Al, but  the present invention is not limited thereto.  [0404]  The compound represented by General Formula (6)  can be synthesized according to JP2007-298569A or JP2009- 199021A.  [0405]  In the present invention, the low molecular weight  compound (C) having a group leaving due to the action of an  acid on the nitrogen atom can be used alone or in a mixture of  two or more types thereof.  [0406]  The content of the compound (C) in the active light› sensitive or radiation-sensitive resin composition of the  present invention is preferably 0.001 % by mass to 20% by  mass, more preferably 0.001 % by mass to 10% by mass, and  still more preferably 0.01 % by mass to 5% by mass, based on  the total solid content in the composition.  [0407]  A basic compound (hereinafter, also referred to as a  "compound (PA)") of which the basicity is reduced or lost by  irradiation with active light or radiation is a compound which  has a proton-accepting functional group and in which the  proton-acceptibility is reduced or lost, or which is changed  from being proton-accepting to being acidic, by being decom› posed by irradiation with active light or radiation, as a basic  compound.  [0408]  The proton-accepting functional group is a group  which can electrostatically interact with a proton or a func› tional group having an electron, and, for example, means a  functional group having a macrocyclic structure such as  cyclic polyether or a functional group having a nitrogen atom  having an unshared electron pair not contributing to it-con› jugation. The nitrogen atom having an unshared electron pair  not contributing to it-conjugation, for example, is a nitrogen  atom having a substructure shown in the following formula.  [0409]  Examples of a preferable substructure of the proton› accepting functional group include a crown ether structure, an  aza-crown ether structure, a primary to tertiary amine struc› ture, a pyridine structure, an imidazole structure, and a pyra› zine structure.  [0410]  The compound (PA) generates a compound in  which the proton-acceptibility is reduced or lost, or which is  changed from being proton-accepting to being acidic, by  being decomposed by irradiation with active light or radia› tion. The reduction or loss of proton-acceptibility or the  change from being proton-accepting to being acidic  described here is a change in proton-acceptibility caused by  addition of a proton to a proton-accepting functional group,  and specifically, it means that, when a proton adduct is gen› erated from the compound (PA) having a proton-accepting  functional group and a proton, the equilibrium constant in the  chemical equilibrium is reduced.  [0411]  The proton-acceptibility can be confirmed by per› forming pH measurement.  [0412]  In the present invention, the acid dissociation con› stant pKa of a compound generated by decomposition of the  compound (PA) by irradiation with active light or radiation  preferably satisfies pKa<-1, more preferably satisfies  - l 3<pKa<-l, and still more preferably satisfies -13<pKa<- 3.  [0413]  In the present invention, the acid dissociation con› stant pKa represents an acid dissociation constant pKa in an  aqueous solution, and for example, it is described in Chemical  Handbook (II) (revised 4th edition, 1993, edited by The  Chemical Society of Japan, published by Maruzen Co., Ltd.),  and a smaller value means higher acidity. Specifically, the  acid dissociation constant pKa in an aqueous solution can be  obtained by measuring the acid dissociation constant at 25°  C.  using an infinite dilution aqueous solution, and a value based  on the database of Hammett substituent constants and known  literature values can also be determined by calculation using  the following software package 1. All of pKa values described  in the present specification are values determined by calcula› tion using this software package.  [0414]  Software Package 1: Advanced Chemistry Develop› ment (ACD/Labs) Software VS.14 for Solaris (1994-2007  ACD/Labs).  [0415]  The compound (PA) generates, for example, a com› pound represented by the following General Formula (PA-1)  as the above-described proton adduct generated by being  decomposed by irradiation with active light or radiation. The  compound represented by General Formula (PA-1) is a com› pound in which the proton-acceptibility is reduced or lost or  which is changed from being proton-accepting to being  acidic, by having a proton-accepting functional group and an  acid group, compared to the compound (PA).  Q-A-(X)n-B-R  (PA-1)  [0416]  In General Formula (PA-1), Q represents -SO$_{3}$H,  ----CO$_{2}$H, or -W$_{1}$NHW$_{2}$Rf’ Here, Rf represents an alkyl  group (preferably having 1 to 20 carbon atoms), a cycloalkyl  group (preferably having 3 to 20 carbon atoms), or an aryl  group (preferably having 6 to 30 carbon atoms), and each of  W $_{1 }$ and W $_{2 }$ independently represents -SO$_{2}$ - or --CO-.  [0417]  A represents a single bond or a divalent connecting  group.  [0418]  X represents -SO$_{2}$ - or --CO-.  [0419]  n represents  O  or 1.  [0420]  B represents a single bond, an oxygen atom, or  -N(Rx)Ry-•  Here,  Rx  represents a hydrogen atom or a  monovalent organic group, and  RY  represents a single bond or  a divalent organic group.  Rx  may be bonded to  RY  to form a  ring, or may be bonded to R to form a ring.  [0421]  R represents a monovalent organic group having a  proton-accepting functional group.  [0422]  General Formula (PA-1) will be described in more  detail.  [0423]  The divalent connecting group represented by A is  preferably a divalent organic group having 2 to 12 carbon  atoms, and examples thereof include an alkylene group and a  phenylene group. The divalent connecting group is more pref› erably an alkylene group having at least one fluorine atom,  and preferably has 2 to 6 carbon atoms, and more preferably  has 2 to 4 carbon atoms. A connecting group such as an  oxygen atom or a sulfur atom may be included in the alky lene  chain. In particular, the alkylene group is preferably an alky- 0  /N  ............  I  0  Unshared electron pair 