How can I play an queued animation based on sprites?

Hello,

Well, here's the thing. I'm making a 2D game. So, I have a prefab and starts with an animation ("aparecer") That's Ok, then after some seconds (that I made with "yield WaitForSeconds"), I trigger the second animation ("parpadear")... That's Ok too (because these two animations doesn't change the sprite, these animations are just some scale changes). But the third one is an explosion and I made a sprite animation called "explotar". (frame per frame it's a different sprite). So, when I try to trigger the third animation... I have to mark it as legacy. That's not a trouble, so I mark that animation as legacy. When I do it, The animation doesn't happen.

I don't know how to proceed now :(... Please, any help would be appreciated.

Here's the code, Thank you so much in advance to all of you.

Regards,

 function animacion(){
 
     animation["aparecer"].speed = 1;
     
 
     // TIEMPO DE ESPERA, DESPUES DE APARECER EL TIEMPO QUE TIENE PARA PRESIONAR
     yield WaitForSeconds (2);
     
     //INICIO ANIMACION DE ALERTA, PARPADEO DE QUE EL TIEMPO SE ACABA
     parpadearQueued = animation.PlayQueued("parpadear", QueueMode.PlayNow);
         
     //LA PONGO EN LOOP INFINITO
     animation.wrapMode = WrapMode.Loop;
     
     // FIJO LA VELOCIDAD DEL PARPADEO, TOMANDO PARPADEARQUEUED QUE ES EL RETORNADO
     parpadearQueued.speed = 1;
     
     // ESTABLEZCO TIEMPO DE LA ALERTA    
     yield WaitForSeconds (5);
     
     //ANIMO LA EXPLOSION    
     explotarQueued = animation.PlayQueued("explotar", QueueMode.PlayNow);
     animation.wrapMode = WrapMode.Once;
     
     yield WaitForSeconds(1);
     
     
     //DESTRUYO EL ELEMENTO 
     Destroy(gameObject);
     Destroy(this);
     
     
 }