67  US 9,958,775 B2  68  Examples of Y  2  of the group leaving  by the action of an  acid include -C(R 36 )(R 37 )(R 38 ),  ----C(=O)-O----C(R 36 )  (R37)(R3s),  ----C(Roi)(Ro2)(OR39),  ----C(Roi)(Ro2)----C  (=O)-O----C(R 36 )(R 37 )(R 38 ),  ----CH(R 36 )(Ar),  and the  like.  In the formulae, R 36  to R 39  each independently  represent  an alkyl group, a cycloalkyl  group, a monovalent  aromatic  ring group, a group  formed by a combination  of an alkylene  group and a monovalent  aromatic ring group,  or an alkenyl  group. R 36  and R 37  may be bonded to each  other to form a  ring.  Roi and R 02  each independently  represent a hydrogen  atom, an alkyl group,  a cycloalkyl group,  a  monovalent  aromatic ring group,  a group formed by a  combination  of an  alkylene group and a  monovalent aromatic  ring group, or an  alkenyl group.  Ar represents a monovalent  aromatic ring group.  An  alkyl group in R 36  to R 39 , Roi and R 02  is preferably an  alkyl group having 1  to  8  carbon atoms and, for  example, a  methyl group, an ethyl  group, a propyl group,  an n-butyl  group, a sec-butyl group,  a hexyl group, an octyl  group, and  the like are included.  A cycloalkyl group  in R 36  to R 39 , R 0 i and R 02  may be a  monocyclic type or  polycyclic type. As  a  monocyclic type,  a cycloalkyl group having  3  to  8  carbon atoms is preferable  and, for example, a  cyclopropyl group,  a cyclobutyl group,  a  cyclopentyl group,  a cyclohexyl group,  a cyclooctyl group,  and the like are included.  As a polycyclic type,  a cycloalkyl  group having 6 to 20  carbon atoms is preferable  and, for  example, an adamantyl  group, a norbornyl group,  an isobor› nyl group, a camphanyl  group, a dicyclopentyl  group, an  a-pinanyl group, a tricyclodecanyl  group, a tetracyclodode› cyl group, an androstanyl  group, and the like  are included.  Incidentally, parts of  carbon atoms in the  cycloalkyl group  may be substituted  with a heteroatom  such as an oxygen  atom.  A  monovalent aromatic  ring group ofR 36  to R 39 , R 0 i,  R 02  and Ar is preferably  a  monovalent aromatic  ring group  having 6 to 10 carbon  atoms and, for example,  an aryl group  such as a phenyl group,  a naphthyl group or  anthryl group  and a divalent aromatic  ring group including  a hetero ring  such as thiophene,  furan, pyrrole,  benzothiophene,  benzo› furan, benzopyrrole,  triazine, imidazole,  benzoimidazole,  triazole, thiadiazole  or thiazole is included.  As a group formed by  a  combination  of an alkylene group  and a monovalent aromatic  ring group ofR 36  to R 39 , Roi and  R 02 , an aralkyl group  having  7  to 12 carbon atoms  is  preferable and, for  example, a benzyl  group, a phenethyl  group, a naphthylmethyl  group, and the like  are included.  An  alkenyl group in R 36  to R 39 , Roi and R 02  is preferably  an alkenyl group having  2 to  8  carbon atoms and,  for  example, a vinyl group,  an ally! group, a butenyl  group, a  cyclohexenyl group,  and the like are included.  A ring in which R 36  and R 37  are bonded to each other  to  form may be a monocyclic  type or polycyclic  type. As a  monocyclic type,  a cycloalky I structure  having  3  to  8  carbon  atoms is preferable and,  for example, a  cyclopropane struc› ture, a cyclobutane  structure, a cyclopentane  structure, a  cyclohexane structure,  a  cycloheptane structure,  a cyclooc› tane structure, and  the like and included.  As a polycyclic  type, a cycloalkyl structure  having 6 to 20 carbon  atoms is  preferable and, for  example, an adamantane  structure, a  norbornane structure,  a  dicyclopentane structure,  a tricyclo› decane structure, a  tetracyclododecane  structure, and the like  are included. Incidentally,  parts of carbon atoms  in the  cycloalkyl structure  may be substituted  with a heteroatom  such as an oxygen atom.  The respective groups  described above as R 36  to R 39 , Roi,  Ra$_{2 }$ and Ar may have a  substituent, and examples  of the  substituent include  an alkyl group, a cycloalkyl  group, an  aryl group, an amino  group, an amido group,  a ureido group,  a urethane group, a  hydroxyl group, a carboxyl  group, a  halogen atom, an alkoxy  group, a thioether group,  an acyl  group, an acyloxy group,  an  alkoxycarbonyl group,  a cyano  group, a nitro group,  and the like and the  number of carbon  atoms of the substituent  is preferably  8  or less.  As Y  2  of the group leaving  by the action of an  acid, a  structure represented  by the following general  formula (VI› A) is more preferable.  Here, Li and L 2  each independently represent  a hydrogen  atom, an alkyl group,  a cycloalkyl group,  a  monovalent  aromatic ring group  or a group formed by  a  combination  of  an alkylene group and  a  monovalent aromatic  ring group;  M represents a single  bond or a divalent  connecting  group; and  Q represents an alkyl  group, a cycloalkyl  group which  may include a heteroatom,  a  monovalent aromatic  ring  group which may include  a  heteroatom, an amino  group, an  ammonium group,  a mercapto group, a  cyano group or an  aldehyde group.  At least two of Q, M,  Li may be bonded to  form a ring  (preferably a 5-membered  or a  6-membered ring).  An  alkyl group as Li and  L 2 , for example, is an  alkyl  group having 1 to  8  carbon atoms, and specifically,  a methyl  group, an ethyl group,  a propyl group, an n-butyl  group, a  sec-butyl group, a  hexyl group and an  octyl group are  preferably included.  A cycloalkyl group  as Li and L 2 , for example, is a  cycloalkyl group having  3  to 15 carbon atoms,  and specifi› cally, a cyclopentyl  group, a cyclohexyl  group, a norbornyl  group, an adamantyl  group, and the like  are included as a  preferable example.  A  monovalent aromatic  ring group as Li and  L 2 , for  example, is an aryl group  having 6 to 15 carbon  atoms, and  specifically,  a phenyl group, a tolyl  group, a naphthyl group,  an anthryl group, and  the like are included  as a preferable  example.  A group formed by  a  combination of  an alkylene group  and a monovalent aromatic  ring group as Li and  L 2 , for  example, is a group  having 6 to 20 carbon  atoms, and an  aralkyl group such as  a benzyl group or a phenethyl  group  is included.  A divalent linking group  as M, for example, is  an alkylene  group (for example,  a methylene group,  an ethylene group,  a propylene group,  a butylene group, a  hexylene group, an  octylene group, or  the like), a  cycloalkylene group  (for  example, a cyclopentylene  group, a cyclohexylene  group, an  adamantylene group,  or the like), an alkenylene  group (for  example, a vinylene  group, a propenylene  group, a bute› nylene group, or the like),  a divalent aromatic ring  group (for  example, a phenylene  group, a tolylene group,  a  naphthylene  group, or the like),  -S-,  ---0-,  -CO-, -SO2-,  -N(R 0 )- and a divalent linking  group formed by a com› bination of a plurality  of these groups. R 0  is a hydrogen atom  or an alky group (for  example, it is an alkyl  group having 1  to  8  carbon atoms, and specifically,  a methyl group, an ethyl  group, a propyl group,  an n-butyl group, a  sec-butyl group,  a hexyl group, an octyl  group, or the like).  An  alkyl group as Q is the  same as each group  as Li and  L 2  described above.  (VI-A)  lO [Chem. 38] 