"Process to prepare 2 - (triazinylcarbonyl)sulfonanilides,Use of n -sulfonyl -substituted 3 -triazinyloxynilides,And processes for preparing n -alkyl -n -[2 -(1,3,5 -triazin -2 -ylcarbonyl)phenyl]alkanosulfonamides ". This invention refers to a process based on the oxidizive opening of the ring of a compound with oxindol structure for the preparation of substituted 2 -(triazinylcarbonyl)sulfonanilides of the formula (1 -1) from 3 -triazinyloxindol n -sulfonyl -replaced formula (2 -1),And 2 -(triazinylcarbonyl)sulfonanilides of the formula (1 -1) thus prepared,And for their use as intermediaries for the synthesis of fine chemicals and active ingredients in the agricultural sector. The invention also refers to a multi -stage process for the preparation of n -alkyl -n -[2 -(1,3,5 -triazin -2 -ylcarbonyl)phenyl]alkanesulfone -mides of the formula (4 -1),Derived from 3 -(alkyl sulfanyl)-1,3 -dihydro -2h -indol -2 -one formula (7 -1),Where the multi -stage process also comprises,As a component step,The oxidative opening of the mentioned ring,And the 2 -(triazinylcarbonyl)sulfonanilides of the formula (1 -1) which are obtained by the oxidative opening of the ring and are used as intermediaries in the multistage process."processo para preparar 2- (triazinilcarbonil)sulfonanilidas, uso de 3- triaziniloxindóis n-sulfonil-substituídos, e processos para preparar n-alquil-n-[2-(1,3,5-triazin-2- ilcarbonil)fenil]alcanossulfonamidas". a presente invenção se refere a um processo à base da abertura oxidativa do anel de um composto com estrutura oxindol para preparação de 2-(triazinilcarbonil)sulfonanilidas substituídas da fórmula (1-1) procedente de 3-triaziniloxindol n-sulfonil-substituído da fórmula (2-1), e a 2-(triazinilcarbonil)sulfonanilidas da fórmula (1-1) assim preparadas, e para o uso dos mesmos como intermediários para a síntese de químicas finas e de ingredientes ativos no setor agrícola. a invenção também se refere a um processo multiestágio para preparação de n-alquil-
