EN EL PRESENTE TRABAJO SE CONSIDERA LA FORMACIÓN DE MOLÉCULAS EN ÉPOCAS PREGALÁCTICAS CARACTERIZADAS POR CORRIMIENTOS AL ROJO 10 < Z < 400. EL CÁLCULO DE LA ABUNDANCIA DE DICHAS MOLÉCULAS SE HA HECHO SUPONIENDO UN MODELO NO ESTÁNDAR DEL BIG BANG QUE PREDICE ABUNDANCIAS SIGNIFICATIVAS DE CARBONO Y OXÍGENO. SE MUESTRA QUE PARA ESTE CASO LA ABUNDANCIA RELATIVA DE LA MOLÉCULA DE CH BASADA EN CARBONO PRIMORDIAL DEBE ALCANZAR UN VALOR SUPERIOR A 1014, MIENTRAS QUE LAS ABUNDANCIAS DE MOLÉCULAS BASADAS EN OXÍGENO PRIMORDIAL RESULTAN SER INSIGNIFICANTES.AbstractIN THE PRESENT PAPER THE FORMATION OF PRIMORDIAL MOLECULES IN PREGALACTIC EPOCHS CHARACTERIZED BY REDSHIFTS 10 < Z < 400 IS CONSIDERED. THE CALCULATION OF THE ABUNDANCES OF THESE MOLECULES HAS BEEN MADE UNDER THE ASSUMPTION OF A NON STANDARD BIG BANG NUCLEOSYNTHESIS (NBBN) WHICH LEADS TO SIGNIFICANT ABUNDANCES OF CARBON AND OXYGEN. IT IS SHOWN THAT FOR THIS CASE THE RELATIVE ABUNDANCE OF THE MOLECULE CH BASED ON PRIMORDIAL CARBON SHOULD HAVE VALUES HIGHER THAN 1014, WHEREAS THE MOLECULAR ABUNDANCES OF SPECIES BASED ON PRIMORDIAL OXYGEN TURN OUT TO BE INSIGNIFICANT.IN THE PRESENT PAPER THE FORMATION OF PRIMORDIAL MOLECULES IN PREGALACTIC EPOCHS CHARACTERIZED BY REDSHIFTS 10 < Z < 400 IS CONSIDERED. THE CALCULATION OF THE ABUNDANCES OF THESE MOLECULES HAS BEEN MADE UNDER THE ASSUMPTION OF A NON STANDARD BIG BANG NUCLEOSYNTHESIS (NBBN) WHICH LEADS TO SIGNIFICANT ABUNDANCES OF CARBON AND OXYGEN. IT IS SHOWN THAT FOR THIS CASE THE RELATIVE ABUNDANCE OF THE MOLECULE CH BASED ON PRIMORDIAL CARBON SHOULD HAVE VALUES HIGHER THAN 1014, WHEREAS THE MOLECULAR ABUNDANCES OF SPECIES BASED ON PRIMORDIAL OXYGEN TURN OUT TO BE INSIGNIFICANT.