What is な-particle doing in `ってなわけで`?


I noticed that `ってなわけで` is commonly used as a substitute for `というわけで` in
colloquial speeches, but what exactly is the purpose of the な-particle in that
phrase? Does it make the context that the phrase refers to adjective-ish, like
suggested in [this
answer](https://japanese.stackexchange.com/questions/1547/using-%E3%81%AA-
particle-after-common-nouns-non-na-adjectives/1562#1562)?

Or is it actually the な-particle that is similar in usage to the one in
`それなのに`? How does the construction work though?




The crucial part you are asking is `ってな`. As you suggest, it is a colloquial
version of `という` that introduces an appositive clause. They are probably
interchangable. The noun is not limited to `わけ`, but has to be able to take an
appositive clause.

> という話, ということ, というわけ, という理由, という記事, という理屈, という説明, という計画, という作戦  
>  ってな話, ってなこと, ってなわけ, ってな理由, ってな記事, ってな理屈, ってな説明, ってな計画, ってな作戦

Furthermore, `って` is a colloquial version of `と` that introduces a subordinate
clause.

> ...と思う  
>  ...って思う

It can also be a colloquial version of the topic particle `は`.

> あの人はかっこいい。  
>  あの人ってかっこいい。

`な` is probably related to the `な` that introdoces a na-adjective in
attributive position. But that does not explain why it is used together with
`って`. Somehow, `とな` is ungrammatical. Maybe you can just consider the whole
`ってな` as a fixed expression.




The crucial part you are asking is `ってな`. As you suggest, it is a colloquial
version of `という` that introduces an appositive clause. They are probably
interchangable. The noun is not limited to `わけ`, but has to be able to take an
appositive clause.

> という話, ということ, というわけ, という理由, という記事, という理屈, という説明, という計画, という作戦  
>  ってな話, ってなこと, ってなわけ, ってな理由, ってな記事, ってな理屈, ってな説明, ってな計画, ってな作戦

Furthermore, `って` is a colloquial version of `と` that introduces a subordinate
clause.

> ...と思う  
>  ...って思う

It can also be a colloquial version of the topic particle `は`.

> あの人はかっこいい。  
>  あの人ってかっこいい。

`な` is probably related to the `な` that introdoces a na-adjective in
attributive position. But that does not explain why it is used together with
`って`. Somehow, `とな` is ungrammatical. Maybe you can just consider the whole
`ってな` as a fixed expression.

